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Tristan Hughes
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Tristan Hughes
hey and welcome to the Ancients. I have just finished recording this episode and it is all about a figure who has been sidelined by Alexander the Great and his conquest. But this man was key to some of Alexander's most legendary successes. How he was able to conquer an island city. This is someone who's also been described as a mad scientist. This military engineer. This catapult inventor. A figure called Diades. This is what I love about the Ancients. We don't just do Alexander the Great. We we can explore these figures that have been sidelined in history over the centuries and bring their tales back to the forefront. This was really fun. It is a story and a half with the brilliant storyteller, Professor Edmund Richardson from Durham University, who's just written a brand new book all about Alexander. Right, having said all that, let's get straight into the episode. Enjoy. 332 BC, and on the shoreline of what is today Lebanon, engineers are hard at work. The sounds of hammers on iron and wood ring out from their tents in a bustling quarter of a much larger camp, a military camp, the base for King Alexander III of Macedon's mighty army, for tens of thousands of soldiers that have crossed over into Asia with their king to fight the Persian superpower. But for the past few months, Alexander's army has stayed in this one place. They have been fighting a long and gruelling battle against a powerful city separated from them by a large stretch of water, hundreds of metres wide. The city's formidable walls can be seen in the distance, reflecting its present status, untouched and unbroken. The city of Tyre. Many believed taking Tyre was an impossible task. But Alexander had refused to back down. At the start of the siege, he had gone to meet with his chief military engineer, Dyades of Pella. Alexander needed a way to attack this city a kilometer off the coast. Diades had to find a solution. What Dyades decided upon was extraordinary. He would build the biggest artificial promontory ever made. A man made land bridge linking the mainland to the walls of Tyre itself. Fast forward several months and progress was proving incredibly slow. Diades had employed thousands of the soldiers carrying load after load of material to slowly build this promontory. But the Tyrians have been resisting it fiercely. They have burned large parts of it down from their ships. They have killed hundreds, if not thousands of Alexander's builders. But Alexander pressed on, reliant on the cleverness of his chief engineer, Diades, to counter these Tyrian attacks. Diades was doing just that. Gradually, the land bridge was edging closer and closer to the great walls of Tyre. And now he has just invented another weapon. Rolling out of his workshop comes a beast, a mechanical beast, a catapult larger than any the world had seen before. It's pulled on wheels and has a long square like wooden frame. Ropes are fixed to the centre of the machine, which can be pulled back with levers to then release a projectile with more force and power than any war machine before in history. Slowly, the beast is wheeled far onto the promontory, protected by ships and towers alike. Then Its crew loads it up with an almighty stone and lets loose. The stone hurls through the air, travelling for hundreds of meters before it comes crashing down in the city of Tyre. For the first time, Alexander's army had managed to hit the city. The Tyrians could only watch on as the Macedonians celebrated their new superweapon. The tide of the siege was starting to shift in favour of Alexander. But there was still much more to do. If Diades was to become known as the man who Took Tyre, he needed more catapults, more towers, more siege weapons, more men. Welcome to the Ancients. I'm Tristan Hughes, your host, and this is the extraordinary story of Dyades and the Siege of Tyre with our guest, Professor Edmund Richardson. Ed, it is such a pleasure to have you on the show.
Professor Edmund Richardson
It's such an honor to be here. Thank you so much for the invitation.
Tristan Hughes
Oh, you're more than welcome. And of course, we're going back to the figure of Alexander the Great, but, I mean, he always takes the limelight, but his story features a whole host of these other fascinating figures that can so easily be overlooked. And I feel this is. This is very much the case with the man we're going to be focusing largely on today, this figure called Dyades or Diades.
Professor Edmund Richardson
He absolutely is someone that most people are never going to have heard of. Whereas if you say, well, I'm kind of writing about Alexander, or I'd like to tell you about Alexander the Great, people are going to just put their head in their hands and be like, this guy, this guy again, again. And all the way back to the ancient world, people were like this guy again. Even Arrian, he opens his history by saying, well, why on earth does the world need another book about Alexander? And that's in the first century. But Deities is someone that very, very few people, even very few classicists, have heard much of or know much about, but he's someone who really made possible some of Alexander's most spectacular victories. And you could really say that without him, there is no Alexander the Great.
Tristan Hughes
Ed, you've got to explain this label, first of all, because Joseph and I were talking about this before we started recording. Joseph, our producer. Why can we potentially call him the original mad scientist or the first mad scientist?
Professor Edmund Richardson
So he's someone whose ideas absolutely reshape reality and he does things that even from the perspective of the 21st century, seem just absolutely barking. You're reading this and you're like, no, no, no, that's not possible.
Tristan Hughes
He did what he did what he
Professor Edmund Richardson
did, how he did. Why? So he's someone who absolutely will not. He doesn't have that kind of sort of little checkpoint or trapdoor that most of us have in our minds. Like when we have an idea that's completely, completely out there and it sits around in our heads for a minute and then we're like, no, no, no, no, that was just a bad idea. I had too much to drink, it was too late, my mind was wandering. Now deities just goes ahead and does it. And because when he's having all these ideas, he, he's also got Alexander and his entire army and the entire resources of the Macedonian state basically at his disposal, he's able to take these ideas which most people would have thought were completely impossible, and actually drag them into reality. So he's someone who we see doing things that no one has ever done before on a quite remarkable scale.
Tristan Hughes
Gosh, that's so exciting. And in particular, it's in regard to siegecraft and one particular siege which we're going to get to. Ed, a few background questions. First of all, Diades, he's this military engineer, isn't he? So just how advanced is military engineering at the time of Alexander the Great?
Professor Edmund Richardson
So what's remarkable is how many things were just taken for granted. You see that quite a lot of the time in these moments, just before the world begins to change. But in the sort of fourth century B.C. and certainly in the fifth, there's a lot of war, there's a lot of battle, there's so much war. But there's also a sense of things that military engineers just can't really be expected to do. Being able to besiege a city, that's fair enough. You can dig a lot of trenches, you can put up some palisades, you can blockade, you can cut off water, you can maybe get some ladders and go over the wall, you can maybe get the inhabitants to betray the city, leave a gate open, that kind of thing. The classics, right? But what you're rarely able to do is actually take a city, a well fortified, strong city, by force. When people read Homer, when people read the Iliad, they're like, wait, they besieged the city for 10 years and they didn't think this was maybe a bad idea? Wouldn't you give up after a year? Well, no, that's the thing. Incredibly long sieges, sieges of well over a decade are very common in the ancient world. And much earlier than Alexander, in the great Peloponnesian War between Athens and Sparta, the Spartans besiege Athens every Year, for literal decades, they march into Attica every year. They devastate the crop state. They send everyone scurrying behind the long walls of Athens. And then they sit there year after year, they just sit there. They don't try to take the city, they don't try to knock the walls down, they don't try to really do anything. They just sit.
Tristan Hughes
One day, one day they're like.
Professor Edmund Richardson
And years pass and 10 years pass and more years pass. Dietes is of a different generation. He comes of age like Alexander, during the period where the Greece of squabbling city states gives way to the Greece of Philip ii, where the power of Alexander's father, Philip II of Macedon and the power of the Macedonian army gradually extends over south from Macedon, over mainland Greece and starts to sort of exert this kind of malign and inescapable influence over Greek Cathars. Now deities is a tinkerer and an inventor and an endlessly curious person. And at the time in 4th century Greece, there's nothing like a technical school or an engineering college or anything like that. You can go and learn from a sophist, you can go and learn from a philosopher. You can either. There are plenty of chaps like trying to sell you a course about the nature of reality or the meaning of happiness or the nature of the universe. But if you want to figure out how to build things or how to break things, then your choices are either apprentice with a craftsman or join the army and join the army of Philip ii. And this is what Dietes does. He enrolls in Philip's army. Now, Alexander's father, Philip cultivated this image of like a one eyed brawler and drinker and buffoon, but he's actually almost always the smartest guy in the room. He just really, really enjoys everyone thinking about how stupid he is and continuing to think about how stupid he is until he's rolled up their territory and picked their pockets and basically kind of made off with whatever he wants to make off with. Philip basically throws every spare drachma he has at the army. He takes this ragtag force, he professionalizes it. He equips the infantry with these gigantic spears that turn them into the phalanx that ripped through the Persian empire. He trains the cavalry into the companion cavalry, which Alexander led to victory against the great king of Persia. But he also spends an absolute fortune on his engineers. He has someone called Polyaidas of Thessaly who diades studies under. And they're not just building existing weapons, they're trying to make New ones. They're trying to make bigger catapults heavier. Just so many ways to basically, basically knock down fortifications and kill people in horrible ways that had never been thought of before. This is basically what Dietes grows up in. He grows up in the greatest school of engineering the world had ever known, which just happens to be the army of Philip II of Macedon.
Tristan Hughes
As so often with Alexander, almost always, the backstory includes his father, Philip II of Macedon, and what he does. And as you say, so Polydis Diades this military engineering school. And one development in particular that maybe we should highlight now, Ed, because I think it's very important, isn't it? In Diades's story is the invention of that time, of the torsion catapult idea. You know, kind of a big contraption, but able to get even more power when you're pulling back those ropes to let loose this missile.
Professor Edmund Richardson
It seems like a straightforward invention, but it's incredibly significant and it's incredibly sort of important part of why Dietes is able to do what he's able to do for Alexander. So, yeah, it's a great one to focus on before this, before, like torsion catapults. So catapults, which are able to store a huge amount of power and then kind of release it all at once with whatever they happen to be throwing across a battlefield. Catapults are very good at kind of scattering groups of infantry or just being kind of awkward things which kind of fill the air with flying rocks. But they're not able to really get up enough power to pose a serious threat to fortification. So you could line up a whole bunch of sort of early Greek siege weaponry, 1st century Greek siege weaponry, and you could bang away at a wall pretty much for a long time. And the chances of that wall coming down, if it was well built, if people were able to kind of conduct repairs, was extremely low. Like the fortification, if it was a well built fortification, was not really going to be under threat. The torch and catapult changes that. The early designs are kind of experimental. They go wrong quite frequently. They often do not drop rocks where they're meant to be dropping rocks, but they throw things with a level of power that simply had not been seen before. And they do so in a way that suddenly changes the equation between missile and fortification. Suddenly, Greek siege weaponry is actually able to pose an actual threat to fortifications, and that really changes the game for warfare.
Tristan Hughes
So Alexander takes these with his army when he invades the Persian Empire alongside Diades and all of his array of military engineers at the most advanced siege machinery of the time. So, Ed, let's set the scene for diades shining moment in that campaign. Shall we start then in November 333 BC maybe on the 6th, should we say maybe on the 6th or around that date? Is that quite a good day to start? What happens around there? What's happening?
Professor Edmund Richardson
Let's absolutely start there. That innocuous sounding date is a moment when the world changes. It's the date of the Battle of Issus, which is the first great clash between Alexander and Darius iii, the great king of Persia. And this is a battle which Alexander is expected to lose. Even most of his army expect him to lose. He's wildly outnumbered and he's been outthought and outmaneuvered by Darius. In the lead up to the battle, he's been on the coast of Asia Minor searching for this gigantic Persian army. The Persian army meanwhile, has snuck up behind him, has caught him unawares, has cut him off from his baggage train, has helped itself to his food supplies, has killed a lot of his wounded and has sent a lot of the survivors back to Alexander with their hands amputated. And it looks like Alexander is about to be just wiped off history. But then of course, at the Battle of issus in November 333, he changes the world. He essentially walks straight into Darius trap and turns it around on him. He traps this giant Persian army in a very narrow coastal plain, so between a range of mountains in the sea so that the gigantic numbers cannot be used against him. They're essentially all stacked up and can't surround him and can't overwhelm him. And he uses this Macedonian army which had been trained at vast expense by Philip, and then is led by him with this kind of reckless brilliance to essentially carve up Darius force. Darius himself when he sees Alexander and his companion cavalry charging at him, turns his chariot, runs for it, flees the battlefield. And so confident was Darius that he didn't just have his vast camp and his gold and his jewels and his carpets and his wine and his special bathtub and everything like just ready. Within striking distance, he had his wife, his son and heir, his mother, his entire family. And Darius loses all of them. Alexander captures them. And this is a defeat such as basically no great king had survived before. It's a miracle Darius is still in power. He falls back to Babylon, tries to rebuild Alexander rather than pursuing Darius to Babylon, rather than trying to end the war in one stroke, basically stays where he is and works his way gradually down the coast of Asia Minor, taking one city after another. Some of them just open their gates, some of them surrender, some of them, however, put up a fight. And it's the ones that really put up a fight, it's the ones that absolutely close their gates and look over their walls with contempt at Alexander and his army, where deities and his genius really come into play.
Tristan Hughes
Amazing. And this coastline today. So this is the coastline of the eastern Mediterranean, Bond day. Syria, Lebanon, Israel, Palestine. That stretch of land we should be thinking of.
Professor Edmund Richardson
Exactly, yeah, Running, basically running down that coast, Syria, Lebanon, Israel, Palestine, down towards modern day Egypt. And it's that stretch of land which is sort of incredibly wealthy and it's sort of a bunch of cities which had changed hands historically between Greeks and Persians and intermediate regimes, and which had been the focus of a huge amount of rhetoric in Greece before the war, where Alexander claimed he was making war on Persia to liberate these cities, places like Byblos and Sidon and Halicarnassus, both Greek and Phoenician cities, where Alexander is claiming that his war against Persia is this war of liberation. So this place is, this part of the world is symbolically hugely important for the story Alexander's been telling about why he's launching this war and what this campaign is for.
Tristan Hughes
So he starts going south, as you say mentioned places like Byblos there. How long before he and his army, including Dyades, how long before they start to meet or when do they start to encounter resistance?
Professor Edmund Richardson
So initially it goes almost suspiciously well for him. In the couple of weeks after the Battle of Issus, basically everyone is so shell shocked by the idea that the great king has been defeated by this unknown kid from the hills of Macedon. This, like, what is Macedon? Where is Macedon? Why is Macedon? No one really kind of why Macedon? Yeah, exactly right. But no one really puts up that much of a fight. So a lot of the Phoenician cities just fully open their gates and pro Persian regimes are dismantled and alternative rulers are put in place. But around a couple of months after the Battle of Issus, Alexander encounters a problem, and it is an extremely large problem. It's the city of Tyre. Now, Tyre is a singular and remarkable city. It's an island city. Well, there's a bit of the city which is a kind of small settlement on the mainland, but then most of it is an island about a kilometer off the coast. And it is one of the most strongly fortified places in the world at the time. The island is surrounded by walls. There's no place to land, the shore is rocky. The Tyrians have an extremely well trained fleet which fully overmatches Alexander's. He absolutely cannot float a boat without it getting just destroyed. Within minutes they have full control of the sea. The city itself is far beyond the reach of even diet most up to date artillery. So Alexander can throw all the rocks he wants from the mainland but just everything's going to hit the sea, nothing's going to even scratch the walls. He can't get anyone onto the island, let alone over the walls. And Tyre of course can easily be reprovisioned by sea. It's a Phoenician city and it has a network of colonies throughout the Mediterranean, most famously Carthage. So it has allies, it has friends, it has money, and it has absolutely no interest in opening its gates to Alexander. Initially it seems like everything's going to be fine. Alexander sends envoys to Tyre, the Tyrians send envoys to Alexander and everyone seems to be about to reach some kind of accommodation where Alexander can just walk into the city sacrifice in the great temple of Heracles or Melqart as the Tyrions call the deity and the star clad God and everyone will be left to go about their business. But through one of those things where, you know, the tone of a debate shifts or the mood in a city shifts, the Tyrians decide, you know what? No, no, no, to hell with that guy. We're not going to open our gates, we're not going to let you in, we will not attack you, but we're not going to say anything nice about you, we're not going to acknowledge your authority. We're just going to sit on our island and basically see who wins this war and then we're going to see, maybe we'll let them in. The Tyrians have no reason to think that Alexander can do anything about this, right?
Tristan Hughes
You know, you're quite right. We might think today just like why the hell do they decide to do this against this figure who's so well known today as one of the greatest military commanders of all time. But as you say at that time, they don't know that really quite yet, do they?
Professor Edmund Richardson
They don't know that. They of course have reports of Darius being defeated, but they don't have an accurate battle report. For all they know it could have been a fluke. For all they know there could be a much larger Persian army just about to descend on Alexander. Certainly Persia is still the world's superpower, right? Alexander is still outnumbered, overmatched, there's no real likelihood for the Tyrians, and indeed for most people, that Alexander will destroy or conquer the entire Persian Empire. Indeed, there's very little reason to believe that that was Alexander's own objective at this point in his campaign. If you actually want to decapitate the Persian Empire, if you actually want the Persian heartland, then you pursue Dorians, you follow him when his army is broken, when he's defeated, when he's running for his life, you follow him. And Alexander could have been at the gates of Babylon in a few weeks after the Battle of Issus, force that could have stopped him. But the Tyrians probably think that Alexander is going to get swept into the sea or he's going to do what a lot of Greek expeditions in Asia Minor did at this point, which was you land, supposedly, liberate a few cities, you grab as much gold as you can and then you run for it. You get the heck out of there before a Persian field army arrives and you declare victory and you sacrifice to the gods. And meanwhile, all the people who welcomed you, who opened their gates to you, who cooperated with you, are getting hunted down by the great king and are meeting very sticky ends indeed. So the Tyrions are like, this is not a long term investment, this is a terrible idea. So they decide they can wait them out. Alexander has not really got much of a reputation for sieges at the time. He's won some battles, but he's not got a reputation for being able to do advanced siegecraft. And Tyre as well had a reputation of being thoroughly impregnable. It happily waited out a 13 year siege during the Assyrian period. So Alexander, as far as the Tyrians are concerned, is going to get bored or get dead long before they have to worry about letting him in.
Tristan Hughes
But so fortunately he does have this array of extraordinary military engineers at his disposal. He goes to diades. What does he say?
Professor Edmund Richardson
So he goes to Dietes and he's like. The conversation is not recorded, but you can imagine him pointing at Tyre and being like, fix this for me. Well, you know, gonna need some help here. Because the Tyrians don't just, you know, refuse to let Alexander in. When he gets to Tyre, when he marches the army to the shore and he takes the mainland settlement, he sends envoys across the water because, you know, he's looking over Tyre and he's getting a little worried and he's like, wait, wait a minute, wait a minute. This might be more of a problem than I thought. The Tyrions kill Alexander's envoys, they kill them publicly. And horribly, they execute them. And then they throw the bodies off the walls of Tyre and leave those bodies on the shore until they're washed away by the waves. Now, of course, in ancient Greece, this is a horrible way to die, because if you are just left for the seas to take you, if you're denied the rights of burial, then your soul will wander as a lonely ghost for the rest of time. Diplomatic envoys, also, by tradition as old as Homer, were thought to be immune from summary execution. The Tyrians don't just refuse to let Alexander in, they do so in a way which is calculated to humiliate, calculated to debase, calculated to sort of perform their contempt for him, for the entire army. Alexander, remember, is pretty insecure at this point. Still, he's only a couple of years on the throne. He knows there's a lot of people in the army who would be very happy to reign in his stead. He knows he's got to keep winning. He's got to keep his army on side in order to maintain his hold on power. So to have the Tyrions show their contempt for him in front of his entire army and for those bodies of his envoys, just a lot to lie there on the shore for days until the waves wash them away with thousands of his men, just looking at them, seeing how helpless their king wants to do anything about it, that is worrying, right? You don't want to be a king who can't keep your men safe. You don't want to be a king who visibly is humiliated like that. Because Macedonian kings tended to have extremely. They didn't tend to die peacefully in their beds, let's put it like that. So Alexander goes to Dietes and he says, fix this.
Tristan Hughes
Yeah. And so what does diades do? Just like, well, this is quite a challenge, but I'm up for the task.
Professor Edmund Richardson
Yeah. So he's got a problem because a lot of the normal ways you might go about taking this city are not available to him. He can't take it by sea. There's no easy way in. And besides, the Tyrians have full control of the sea. He can't attack the city with his artillery. He can't sort of try to attack walls or gates or fortifications or anything like that, because absolutely nothing he's got will come close to reaching the island, let alone even scratching the walls. So what does he do if the geography keeps Tyre invulnerable? Dietes decides to change the geography. He starts doing something which there's really no precedent for on anything like this scale. He starts building a causeway from the mainland to the island. Now, remember, this is over a kilometer across open sea, so this is a wild undertaking. The idea that you could build something on that scale is just absolutely absurd if you think about it in terms of any ancient Greek siegecraft, which has gone before. And when the Tyrians see what Dietes is doing, which is basically demolishing every building, cutting down every tree, taking every rock and starting to throw them into the sea, so that you start to see from the shore, this causeway beginning to advance a few meters at a time, they think it's the funniest thing they have ever seen in their entire lives. They cannot believe that someone would be so arrogant and so foolish as to think that this would actually work or that this would intimidate them. It becomes overnight the absolute show of the season in Tyre. People literally outfit pleasure boats, like, they take picnics, they leave the siege city, they sort of heave to, just. They row out, they sail out, and they heave to just about of like, arrow or catapult shot. And they just watch all of these Macedonian soldiers, like, lugging rocks down to the waterside and sweating and cursing and throwing all of the stuff into the sea, which, of course, just seems to be swallowing it up.
Tristan Hughes
You can imagine going like, you're doing great. Just one more rock, you're nearly there.
Professor Edmund Richardson
That's literally what they say they're like, so you're planning to defeat Poseidon now? What are you planning to do? Do you really think this is going to work? And there's literally for days and days and days, they come and they just shout remarks over there like, look at these poor guys. They used to be soldiers, look at them now, just heaving rocks back and forth. You look stupid. And this goes on. Deities ignores him, just keeps going and just keeps going, one day after another. And when everything on the mainland, every structure on the mainland is demolished, he sends thousands of men up into the hills to cut down trees. He sends other parties out to quarry out stone. He just keeps going. And he's got almost all of the army working on this. He's got tens of thousands of men just doing nothing but hauling rocks. He's got carts, he's got mules, he's got Alexander himself, who's out there in the front ranks of the men throwing stones into the sea himself. And gradually this causeway starts to advance.
Tristan Hughes
And is this when the Tyrion attitude starts to change, be like, oh, actually, this is getting closer?
Professor Edmund Richardson
Yeah. They start to treat it as a bit less of a Joke. And they start to get a little bit more worried. Now it's only still, it's maybe, maybe 50, 100 meters offshore and it's still nowhere near the walls of Tyre. And it's only advancing at a couple of meters a day, but it is advancing. And now instead of pleasure birds, the Tyrians send warships, they man their galleys, they send them out stuffed full of archers and they basically descend on the men who are building the causeway and they just pour arrows into them. And because they are out on the open sea with no protection and no fortifications and no armor because they're hauling rocks and you really just can't wear armor and haul rocks at any scale. It's brutal. There are massive casualties. The Tyrians keep doing this. So Dietes realizes, look, I've got to find a way to keep my guys safe. So he starts building some other things and he builds these two enormous siege towers which he stations at the end of the causeway and which basically move down the causeway as the causeway advances. They're multi storey constructions and they've got siege weapons of their own inside them and they've also got like a huge amount of space. So if any of the Tyrian galleys arrive, basically all of the Greeks can either retreat to the shore or they can retreat inside these towers and they can pour down artillery on the Tyrian warships. And pretty soon the Tyrians realise, okay, this attack isn't working so much. It just isn't as effective as it had been. And the Corsair keeps advancing.
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Professor Edmund Richardson
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Tristan Hughes
Let's get started.
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I guess I'll let myself out.
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Congratulations.
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I mean it.
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Tristan Hughes
What I love about this so far, Ed, is, and I'm sure there are still many twists and turns to go, but it's almost like a strategic game of chess. You've got the promontory being built, then the Tyrians finally reacting, and now Diades reacting himself with these siege towers. And now the Tyrians have to take a step back thinking, how are we going to change our strategy?
Professor Edmund Richardson
It's absolutely a game of chess. And that's what makes the story of the siege of Tyre so kind of fascinating and horrific, because the Tyrians are extremely competent opponents. This is not a city that is helpless in the face of Alexander's stratagems. They give as good as they get, but they're not so much engineers like dietes. What they are is chemists. Now, the Tyrians, the great mainstay of Tyre's economy, was a particular color, purple. The deepest, most incredible color in the ancient world. The color of dried blood. It's the purple that later would dye the robes of Roman emperors and at the time would dye the robes of the great king of Persia. This purple is only made entire and it is the most valuable substance by far in the world. Like a tiny little vial of this purple dye would be worth far more than its weight in gold. The Tyrians make it, and it is A disgusting process, it truly is. They distill it out of the shells of sea snails and these just giant vats along the shore with these snails decomposing and getting pounded down and just having horrible things done to them along the shore of Tyre. But what this gives the Tyrians is skills in chemistry and skills in making horrible, horrible things which they will put to work in the later stages of the siege against Alexander's army. And when they're faced with dietes siege towers, when they realize that just sending ships against the promontory just can't stop it advancing, they put their chemists to work and they put their sailors to work and they come up with this kind of remarkable countermeasure, which is unlike anything the Greeks had ever faced before. And it's a fireship, a fire ship.
Tristan Hughes
Okay, Right. So is that as, as, as it sounds, Ed, just loading up a transport ship or. No, something not as valuable as a warship, something that they could. That could be expendable and then just loading it up with the materials and then lighting it near the promontory.
Professor Edmund Richardson
Exactly. They take the biggest, ugliest ship that they've got, which is this old horse transport, right? It's low slung, it is shoddily built, but it's also a big old thing because it's got to have enough room for dozens of horses on board, and they load it up in secret in the harbour of Tyre. In one of the harbours of Tyre, which faces out to sea, so it's completely out of sight of Alexander and his men. They have no idea what's happening going on. And they load it up with every kind of inflammable material they can. They stuff it with straw, they douse the straw in, like, pitch and bitumen. They paint the masts and the rigging of the ship with, like, pitch, and they just load this thing up with tons of, like, all the most unpleasant and inflammable things that they possibly can, and then they tow it out of the harbour in the dead of night. Now, the Tyrians are incredible seafarers, and what they're doing with this fire ship is unlike anything that anyone has done with a fireship before in warfare. Now, people have used fire ships before, generally pretty small, pretty haphazard, but they would generally just be lit on fire and turned loose, and you just hope that the wind would send them in the right direction. This, however, has got a couple of warships towing it and has got a crew on board who haven't lit it yet. Instead, they're running quiet in the dead of night. And behind the fire ship, there's a whole bunch of small boats filled with guys with swords and axes and spears and just every kind of unpleasant thing. So there's this little flotilla that leaves the harbor and the dead of night. And the Greeks have absolutely no idea what's happening. They have no idea what's coming. And this little armada just sails around the city of Tyre and bears down on Dietes promontory, which is incredibly quiet. There's like a couple of watchmen, not really much happening. And the first that the Greeks know about this, the first that they realize what is happening is when there's this sudden gout of flame in the darkness of the west. And what is happening is the crew on board the fireship are running around as fast as they can, kindling every bit of the ship in turn. Then the warships, the two ships that are towing it, pick up speed. They row absolutely as fast as they can. Meanwhile, this thing behind them is turning into a fireball. The crew are diving off to be picked up by the small boats. There are these, these pots of kind of inflammable material in the rigging which are starting to explode and sending gouts of flame out into the night. This whole thing is turning into an enormous fireball. And the two warships just keep going until they're just within a few meters of the promontory. Then they cast off their ropes. They veer off absolutely at the last moment. And the fireship, which has never got its sail set, but is just running on the momentum, crashes straight into the promontory, guided into it right next to Dietes siege towers. And the whole thing just immediately goes up in flames. The Tyrians land from the smalvoats, from the warships. They set more fires. They light both of Dietes two towers on fire, and then they reboard their boats and then they haul off and they wait for the Greeks to come and try to put them fire out, which of course they do. Hundreds of men rush to the promontory trying to extinguish the flames. And the Tyrians then just absolutely lay into them with arrows, with every kind of artillery from all of the boats. The Greeks are kind of silhouetted against the flames, so it's just basically target practice for them. And they only sail away when the two siege towers are gutted hulks and the promontory itself. A lot of the furthest out to sea bits of the promontory are just burned to ashes. So this is a huge and horrible setback for Dietes and For Alexander.
Tristan Hughes
Well, I mean, but also, what a scene, quite frankly, for anyone wanting to do an Alexander the Great epic in the future. Just saying, you got to include this story. But yes, Ed, on that other side of things. I mean, imagining dietes and Alexander waking up and seeing it all aflame like that red orangey flame high up into the sky at the dead of night, and then thinking, like, do we give up or do we keep going? What do they decide next to do?
Professor Edmund Richardson
And giving up would make sense, right? Because so far, Alexander has been fully out thought, outplayed, outmaneuvered. The Tyrians are still secure in the city. He's managed to inflict basically minimal casualties, and he's still hundreds of meters from the city. He's not even got halfway yet. But Alexander decides to keep going. So did basically is set to work rebuilding the broken promontory, building two new, larger, fireproof, this time, siege towers, and basically just keeping on going. The work advances, the promontory advances. But then when they start to get further offshore, of course the seabed slopes down, so they find they have to throw even more rocks, even more trees and even more materials into the ocean, into the sea, in order to hopefully sort of start to build the promontory up. So the work slows down. It's frustrating, it's exhausting. The Greeks have fed up. They defeated the great king of Persia, they looted more money than any Europeans in history. They ought to be able to be back home spending money which would last them for generations. But here they are hauling rocks, getting made fun of, getting killed. And just months and months into the siege and Tyre still seems hundreds of meters away, it still seems incredibly far. But then things start to change and the siege starts to turn and events start to go Alexander's way.
Tristan Hughes
How does diades play a key role in that turn?
Professor Edmund Richardson
One is luck and one is skill. And the one thing that is luck is that Alexander starts to get some ships. A lot of the cities further up the coast, which had previously surrendered to Alexander, had had their fleets out fighting for the great king of Persia. When they realised that the city back home has gone over to Alexander, the commanders defect as well. Alexander manages to round up a fleet of several hundred ships. He's able to get naval supremacy, he's able to essentially bottle the Tyrian fleet up in the harbour, or at least temporarily, and he's able to sort of stop the raids on the promontory. So that helps a lot. Then Dietes comes up with a new catapult. It's a version of this torsion catapult which you mentioned earlier, Tristan, but this is kind of the big version.
Tristan Hughes
This is the big mama catapult, okay?
Professor Edmund Richardson
This is the beast. And he's been experimenting on this for weeks, but he finally manages to get it into service and stop it kind of coming to pieces and sending the rocks in the wrong direction. And he lines up a few of them on the end of the promontory and sort of mentally crosses his fingers, so to speak, and tests them and he finds that they don't just reach the walls of Tyre, they reach the walls with sufficient force to do damage. And this is horrifying for the Tyrians because they have artillery of their own, they have siege engines of their own. And as I said, they're the world's foremost chemists, they're incredible engineers. But their own catapults, even when they're firing from the walls, even when they're firing from high above, cannot reach the causeway. They can't reach diadesis machines. So they're starting to realize, wait a minute, this is something here that we have no idea how to defeat. This is a kind of technology we've never seen before. And did. He just keeps building these catapults and he keeps lining them up and he just essentially batters the walls of Tyre and comes up against and starts to do some serious damage. He's not managed to knock anything down. He's not managed to sort of clear a path yet, but he's able to hurt the city in a way that it had never been hurt before. So the Tyrians are starting to get
Tristan Hughes
really nervous psychologically, as you say. It's a hammer blow that now actually Tyre for the first time is being physically attacked. And so just to clarify, Ed, they can't do their fire ship trick again? They can't send galleys out full of archers to dismantle those beast catapults because of that other thing that you mentioned, because Alexander now has a navy protecting.
Professor Edmund Richardson
Yeah, so Alexander now has a fleet. It's not infallible. The Tyrians do actually stage another raid. They actually put up sails across the mouth of the harbour so that Alexander can't see what's going on. They sort of build the outfit this kind of swarm of ships and they hear rumors that Alexander kind of tends to have a nap in the middle of the day, tends to disappear into his tent and like, and just fall asleep and not be seen for hours. So they're like, okay, well that sounds like a good time to try to do Something. And so one day, in the middle of the day, they drop the sails and they just send everything, basically, they send everything in the harbour. And they don't try to raid the promontory, interestingly, they try to raid Alexander's fleet, which is for the most part drawn up on shore so that the sailors can rest and they can eat. And they descend on this fleet and they just start laying about them every way they can. They set ships on fire, they kill crews, and the ships that are afloat only have kind of pretty, pretty minimal crews at the time, so they're able to pretty, pretty quickly overwhelm them. Unluckily for them, Alexander isn't having a nap. He's actually with his fleet and he basically orders everything he's got to launch. But what he doesn't do is attack the Tyrion fleet. What he does is row like mad to try to block the mouth of the harbour so that the Tyrion fleet is cut off from their retreat. They can't actually get home. And once the Tyrians realize this is happening, they basically just have to engage in this kind of race with Alexander's squadron to see if they can actually get back into the harbor. Most of them make it back, some of them are cut off, but after that, they're basically bottled up in Tyre. And meanwhile, Dietes Promontory has actually reached.
Tristan Hughes
Diades has done it. He's done the impossible.
Professor Edmund Richardson
So he's done it. He's done the impossible. And this promontory, by the way, still there, the city of Tyre still got this long, long, kilometer long promontory between the mainland and what was the island city. So this isn't just a bit of siege engineering. This is something which changes the geography of the city permanently. The promontory is astonishing. And one of the things I was trying to do in the book was kind of model. Okay, well, just exactly how much kind of material would this have taken? And it's like equivalent of 888 or so statues of liberty or, you know, a 13th. The Great Pyramid of Giza. Right. So this, this vast feat of ancient engineering, when you bear in mind this is done just over the course of six or seven months. It's one of the most remarkable engineering feats in ancient history.
Tristan Hughes
I mean, Ed, absolutely. And I would personally argue maybe alongside the medallions you get after his victory in India at the Hydaspes, maybe also alongside, for my nerdy obsession, the sarcophagus of Nectanebo, where Alexander might have been temporarily placed his body, that causeway that you can still see today has to be one of the top surviving archaeological features anywhere in the world that you can go to and say, Alexander, you know, was there or was involved in the creation of this. That's amazing.
Professor Edmund Richardson
It really is. Now, I agree. It's one of the ways that you can just unambiguously see the world change forever because of this campaign. And it's easy to focus fully on just the narratives of destruction. But you can see in so many ways, Alexander's presence and also the world that he left behind kind of woven through our reality in so many ways that are profound.
Tristan Hughes
And so the promontory has reached the wall. Massive task. But, Tyers, the walls of Tyre still need to be breached. There's still more to go. Edd.
Professor Edmund Richardson
There is. And all of this, all of this building, all of this heaving of rocks, all of these battles, the fireships, the catapults, all of this has just managed to get Alexander in the same place as most ancient armies, staring up at a vast array of city walls and fortifications and towers and gates, without, generally speaking, a good plan to get through them. Because, remember, Spartans have absolutely no chance to knock down the walls of Athens. Takes them decades. They still don't manage to do it. They have to get the Athenians to demolish their own walls in the end. So Alexander still, He's not won it. He's not come close to winning it yet, but he is tired and he's impatient and the army is very impatient. So did he now, has got his catapults attacking Tyre, not just from the causeway, but he's managed to get some of them mounted on. Right, he's got some kind of old, olden sort of heavy ships where he's got catapults mounted on them. And he's. So he's say he's got a few of them sailing around, around Tyre and sort of battering at the walls by sea, and he's starting to build ever more strange and elaborate contraptions. So he's even got a sort of shipborne battering ram which is slung between two warships, which. How effective this was, I don't know, like, not hugely, I'm going to guess. But the sort of. The battering ram is powered by the rowers of the ships and he's even got this kind of giant drill which is sort of boring into the walls of Tyre. So he's got all of these wild contraptions which are attacking Tyre from every direction.
Tristan Hughes
These feel more like the contraptions you mentioned, right? At the start where he has an idea late at night and then he's just like, yes. And Alexander's like, yes. And then it happens.
Professor Edmund Richardson
Yeah, it's basically all sorts of versions of deities being like, so I thought we could do. And then Alexander's like, yes. And. And so there are all these strange things. Alexander is out of patience. He doesn't want to wait for deities to just fully bring down the walls of Tyre. He wants to attack immediately. So he orders Dietes two siege towers, the two towers that were protecting the builders on the causeway. He orders them to make a full frontal assault.
Tristan Hughes
And so those towers have been rebuilt as well, the ones that had been burned down.
Professor Edmund Richardson
Okay, exactly, yeah. He's built two larger fireproof towers and they've essentially been gradually sort of added to and elaborated until they're these multi story contraptions, maybe 10 stories tall or so and kind of lumbering very unsteadily down the promontory. And Alexander orders a full frontal assault. So he orders the two towers to be pushed up to the walls of Tyre, basically at the front gate. And he orders his men to go over the wall. Now this is way too obvious, right, because going straight over the front gate from the two very large towers, which the Tyrians have seen lumbering towards them for months, is a way too obvious version of a frontal assault. They have been able to see this coming for months and they've been able to make plans against it for months. So Alexander loads his best men onto the towers, they're pushed forward, they make contact with the walls, they lower bridges from the top storeys of the towers onto the battlements of Tyre. And Alexander's men swarm across. Horrible things start to happen to them. The Tyrians don't just attack them with arrows, with siege artillery, because they've of course had plenty of time to line up the range, to line up shots, to have catapults ready to go to hit those towers, to hit the points of the battlements where the men start swarming across. They attack them with some of the most advanced and some of the most horrific chemical weapons that have ever been deployed in ancient warfare. Now, the most gross of them and the most horrific of them is burning sand. The Tyrians take sand from the shore, they heat it in these giant stone vats until it is molten. Now, this isn't a temperature of 100 degrees or 200 degrees. This is sand will maintain heat of well over 1,000 degrees Fahrenheit. And they heat it and then they ladle it very carefully into Specially modified catapults, and they fire it, not at the towers but at Alexander's men coming over the wall. And the sand lands on them and it just explodes in this rain of grains of superheated molten sand. And these are the toughest of the tough, right? These are the men in the toughest army that the world had at the time. And they are just destroyed by it. The sand gets into the crevices of their armor, it burns through clothes, it burns through flesh, it burns through eyes, it burns through metal. And it essentially tortures these men to death. The first and bravest, the toughest of the tough. Because the Tyrians don't just want to kill Alexander's men, they don't just want to kill the Macedonians. They want remember the thing at the start of the siege where the Tyrians didn't just kill Alexander's envoys, they threw them off the walls so that their bodies would stay there for days. They want the rest of the army to see their best and bravest dying, screaming, helpless in agony. And they want them to look at Alexander and see that he cannot save them and he did not save them. So the Macedonians first off the towers, they scream, they die. The Tyrians have these gigantic iron hooks which they send down and they pluck people off the siege towers and they fling them through the air into the sea. The Macedonians see them, their men pinwheeling through the air, screaming, falling to their deaths. And it goes on like this. Wave after wave come up the towers. Wave after wave die in agony. Until Alexander, who hasn't gone over with his men, which makes you think that because he was normally at the front of every attack, in the front of every battle, this time he doesn't. And it makes you think, well, maybe he knew that something beyond even him was about to happen. Until eventually Alexander orders the retreat. The towers pull back, the Macedonians pull back. And the mood that night in camp is really, really bleak and really dangerous for Alexander because they've spent months, they've spent over half a year besieging the city and they have got absolutely nothing for it at
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Tristan Hughes
It's funny because when you think of people after Alexander, like potential, some of his generals in the successor wars, when they have a defeat like that or a humiliating retreat, like one man called Perdiccas, when he fails to cross the Nile, he's murdered that night when his adjutants feel the mood is changing in the camp. So I guess Alexander may, you know, the fact that he avoids that fate at that time, I guess, you know, he is the king and he's, he's got bit more, he's got a bit more clout. But at the same time maybe not because they've been doing it for months on end the fact he survives that night. Is this actually a key moment in his life this very night?
Professor Edmund Richardson
It isn't. I think Perdiccas is a great example and you know, you've done such wonderful work on Perdikas, such a huge fan and yeah, Perdiccas just unceremoniously murdered after basically his first defeat. And Alexander has to play this really cast athlete because even the people in his army who are normally unquestioning supporters of him, people like his soothsayer Aristander, are clearly turning on him because Aristander subsequently says to his man, the army, well, Tyre will be captured within the month. And there's this just low bleak chuckle from the men because it's the last day of the month and Tyre is clearly a long way from being captured. Alexander has to full on rewrite the calendar to add a couple more days to the month in order for this prophecy not to kind of rebound on him immediately. But one thing Alexander is very good at doing is adapting to horrible situations. Like when we were talking about the battle of Issus a little earlier, that great victory Against Darius III started out looking like a hideous defeat. Alexander had been ambushed, he'd lost his baggage, he'd lost his wounded, he lost most of the people he was meant to be keeping safe. And so that generally looks like a king who's about to be defeated in an army which is about to turn on their king. But Alexander gets his men to hold on there and he turns it around and the same thing happens here. Alexander, when you look at the story of his campaign, this is not someone who never gets anything wrong, this is not someone who never has horrible things happen to him. But this is someone who's extremely good at adapting and improvising and figuring out how to think his way and fight his way out of these problems. And this is what he does. He gives did time to actually bring down the walls of Tyre. He says, all right, go for it. Let your catapults go.
Tristan Hughes
Yes. How does Diades then manage to take Tyre?
Professor Edmund Richardson
So he makes a plan which is rather more complex and rather more subtle than Alexandra's. Just go in the front gate, approach, he lines up all the catapults he can and he concentrates their fire on the front walls of Tyre, on that place where Alexander unsuccessfully attacked the first time. And gradually, because these catapults are firing at point blank range and he's got so many of them now, he starts to bring down the walls, he starts to make a breach in the fortifications for the first time in the history of Tyre, and he begins to make space for Alexander's men to attack. Meanwhile, though, he's got ships battering at the fortifications and he's built a siege tower on top of a ship. He's got this, we think, is probably again an old transport ship, a sort of heavy, wide beamed ship, where he's built a siege tower on top of a ship, which means that Alexander and his men can sail up to a point around the fortifications where the Tyrians hadn't got a chance to put large numbers of men, they hadn't got a chance to station this incredibly elaborate machinery with the burning sand and, and the catapults ready to fire at point blank range, where the defences were much, much lighter. So Alexander, a couple days after his, you know, ignominious retreat, he attacks again. But he attacks from several directions at once. Most of his army goes in the breach in the walls in the front, but he and some of his men go over the walls from the sea, they swarm up the siege tower from the ship and they go over the walls from the coast and Then once they're in the city, they take the harbour and that allows Alexander's fleet to swarm into the city from the sea and then a whole bunch more men to land. So Tyre is essentially overwhelmed from several directions. And the Tyrians don't give up, they keep fighting. They fight street by street, house by house. But Alexander and his men have them just hugely outnumbered and hugely outclassed and they just brutally make their way through the city, killing men, women and children, enslaving some women and children, burning houses. There is so much anger, right? There is so much anger. And when Alexander feels his power totter, when he feels himself coming close to defeat, then he reacts with just extraordinary brutality, which is driven by the sense of the impermanence of his power, the fragility of his power. The attacks that he unleashes after that, those moments of fragility, those moments of vulnerability are the most brutal in his entire campaign. And Tyre is perhaps the most brutal of them all. Almost all of the men of fighting age are killed, the women and children are enslaved, even dragged away from many of the temples and killed. And then 2000 of the surviving Tyrians are crucified. Now this is an act of mass execution which takes huge amounts of time and resources and cold blooded brutality. But it's a message, right? It's a message to the rest of the Persian Empire, to Alexander's Greek allies. 2000 Tyrians are crucified in this long bleak line stretching along the shore, just one after the other after the other after the other. And their bodies are just left up there. And then Alexander walks into the temple of Melkart, into the temple of Heracles, and he makes his sacrifice vice and Tyre is left a depopulated ruin.
Tristan Hughes
Wow, what a story that is the siege of Tyre. But I. We don't have time for this. But I know that Ty will bounce back very quickly, doesn't it? And regardless it still it will rise again in the time of the successors. But I mean Ed, Alexander is always at the forefront when exploring the siege of Tyre and how he conquers it. But let's not forget Diades. I mean he is known as actually the man who took Tyre. Is this the zenith of his career or what happens to him next? Do we know much else about Diades story and what happens?
Professor Edmund Richardson
We know a little, I think calling him, as scholars have, the man who took Tyre is more than just. And Alexander essentially puts him to work, work solving impossible problems, solving problems which should not be solvable by ancient warfare. So after Tyre his army, Alexander's army goes on down the coast to the last essentially Persian outpost on the road to Egypt, which is the city of Gaza. And Dietes once again uses this remarkable siege craft to take what should be an impregnable city and defeat the Persian governor Battus, who had thought that he would be able to kind of slow Alexander's advance down. So, yeah, Dietes is the man who solves the problems that Alexander would never be able to solve on his own. And he's put to work doing that throughout the rest of his campaign.
Tristan Hughes
It is such a pleasure to cover his story. Ed, does the name Diades. I mean, does he become a bit of a legend for future Greek and Roman military engineers?
Professor Edmund Richardson
So he's the hero of every Mechanicus, every siege engineer in the ancient world. We don't have time. But the history of siege warfare in the centuries after Alexander is ever more elaborate and wild. I mean, if you thought Dietes promontory and siege towers were outrageous, some of the contraptions that are built by Alexander's successors and by some of their engineers are just even beyond this. So blueprints, which allegedly were by Dietes, find their way into ancient manuals of siegecraft. And some of them are more plausible than others. Of course, calling a catapult an original Dietes is like calling a painting an original Leonardo for ancient siege engineers because he's sort of the hero and in many ways the founder of the profession. So we see his designs and we see his battles talked about by ancient engineers and his designs put to work and modified and elaborated all the way through the Roman period. So, yeah, deities is, if you've heard of him, you've heard of him in the ancient world. And for every Roman siege engineer, for every kind of mechanicus in a field somewhere in Germania trying to get a catapult to work, deities is absolutely the hero of the profession.
Tristan Hughes
I mean, Ed, you've teed up another episode we can do in the future. If you thought this story was amazing, if you thought this siege craft was amazing, feels like we got to do the siege of Rhodes with Demetrius, don't we? A decade or so later, that. That's. That's the next level in the story.
Professor Edmund Richardson
I would love to talk about with that. That with you sometime.
Tristan Hughes
That'd be a lot of fun. But it has been such a pleasure to cover this figure's story. As mentioned at the start, all these remarkable figures that accompanied Alexander, they can be easily overshadowed by Alexander's name. Today we're bringing diddies back into the spotlight through this, this brutal but at the same time very extraordinary story. Ed, you cover it in your brand new book, this groundbreaking new book.
Professor Edmund Richardson
It is called, it is about Alexander. It's called Alexander, God King man and is out with Bloomsbury now.
Tristan Hughes
Ed, it just goes me to say thank you so much for taking the time to come on the show.
Professor Edmund Richardson
Thank you so much. It's such an honour. Thank you so.
Tristan Hughes
Well, there you go. There was was the brilliant and lovely Professor Edmund Richardson talking you through this incredible story. The story of Dyades and this brutal siege of Tyre. How Alexander and his army conquered this island stronghold. What a story. As mentioned, we will have to do the follow up great island city siege tale. What happened after Alexander the Great, the siege of Rome Roads with Demetrius, which is like the siege of Tyre in regards to these fascinating military contraptions and this strategic game of chess that happens between the attackers and the defenders. If you want that as the follow up, let us know. We'll get EDD back on for that and it will be a fascinating episode. If you want more from this time period. In the meantime, well we'll put links in the description to our series series our recent series on the story of Alexander the Great and also an episode we recorded a year or so ago with Catherine Pangonis all about the city of Tyre. Those episodes we'll put links to in the show notes. In the meantime, thank you for listening to this episode of the Ancients. Please follow the show on Spotify or wherever you get your podcasts. That really helps us. You'll be doing us a big favor. If you'd be kind enough to leave us a rating as well. Well, we'd really appreciate that. Don't forget you can also sign up to History Hit for hundreds of hours of original documentaries with a new release every week. Sign up@historyhit.com subscribe that's all from me. I'll see you in the next episode.
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Host: Tristan Hughes
Guest: Professor Edmund Richardson
Date: July 30, 2026
This riveting episode of The Ancients shines a spotlight on Diades of Pella—an obscure but pivotal figure in Alexander the Great’s military machine. Described by some as antiquity’s original “mad scientist,” Diades spearheaded some of history’s most extraordinary feats of military engineering, particularly at the infamous Siege of Tyre (332 BCE). Host Tristan Hughes and guest Prof. Edmund Richardson unpack Diades’s life, innovations, and legacy—moving beyond the shadow of Alexander to highlight the collective ingenuity behind his conquests.
Further Exploration: