In 1943, as the tide of war turned against the Third Reich, the German high command opted for a desperate strategy on the Eastern Front. Outnumbered and outgunned by the Red Army, the Germans pinned their hopes on a mobile, aggressive defense to stop a relentless series of Soviet offensives in Ukraine and southern Russia. As today’s Ukraine fights over many of the same battlefields of 1943, it has chosen a strategy that echoes the German approach from 80 years ago. After the failure of its much-anticipated summer counteroffensive, and running low on ammunition and stamina to fight off continual...