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D Day, traitors and evacuees

In the early hours of 17 May 1943 a bold World War II attack destroyed two dams in the Ruhr Valley in Germany's industrial heartland, causing 1,600 casualties and catastrophic flooding which hampered the German war effort.The dams were highly protected but 617 Squadron of the Royal Air Force had a new weapon – the bouncing bomb. Invented by Barnes Wallis, the weapon was designed to skip over the dams' defences and explode against the sides. The Dambusters mission was a huge propaganda success for Britain and later inspired a famous film.In 2013, Simon Watts spoke to George "Johnny" Johnson, the last survivor of the Dambusters squadron.(Photo: Squadron Leader George "Johnny" Johnson. Credit: Leon Neal via Getty Images)

In World War II , Britain set up a secret organisation which waged war in Nazi occupied Europe. Noreen Riols, a former member of SOE, who helped train the agents, recounts her experiences in Churchill' s secret army.(Photo: A group of SOE agents during training. BBC copyright)

In 1943, the Royal Air Force attacked a set of dams in Germany's Ruhr valley which were considered indestructible. Flying low and at night, the crews used special bouncing bombs to bring down two of their targets. The Dambusters mission was a huge propaganda success for Britain and later inspired a famous film.Simon Watts talks to Johnny Johnson, one of the few survivors of the raid.PHOTO: Johnny Johnson (far left) with the rest of 617 squadron (DAMBUSTERS) at RAF Scampton, Lincolnshire, 22 JULY 1943 (Imperial War Museum).