After Russia’s full-scale invasion of Ukraine in February last year, Chancellor Olaf Scholz of Germany told Parliament that the attack was a Zeitenwende — a historic “turning point” for Europe and Germany. The risk of a large land war in Europe had previously been considered far-fetched, but recent years of Russian aggression have inspired fear in Germany and a 100-billion-euro fund to bolster its military. In Germany, skepticism of the merits of military strength has enabled a long post-Cold War process of disarmament. As a result, it is a historic anomaly in the heart of Europe — an economic leviathan but a military minnow. Now German leaders are vowing to transform the country into a military power capable of taking responsibility for Europe’s security. In Nienburg, a medieval town in Lower Saxony, civilians come to train for “homeland protection” units in the country’s reserves. The question is whether a hesitant German society can follow through on this paradigm shift. “I w...