The epic battles fought at Stalingrad and Kursk were pivotal events in the war on the Eastern Front. After the catastrophic failure of the German offensives of 1942 and 1943, the Wehrmacht was forced onto the defensive. Never again would it regain the initiative against the seemingly inexhaustible forces of the Red Army. But how did this decisive shift in the balance of military power on the Eastern Front come about? This question has intrigued historians...