In his room in a London lodging house, Stahl could not sleep. He lay on his cot oblivious to the noises of an uneasy household of single, displaced men-grunting, arguing, farting, fighting-the walking wounded of life, not war-and stared at the ceiling. Image after image flashed onto it, the family trees of battle formation: Army Group North, von Leeb, 21 Infantry Divisions; Army Group Centre, von Bock, 32 Infantry Divisions; Army Group South, von Runstedt, 63 Infantry Divisions. If that didn’t put him to sleep he’d start on the Panzers.