Author of an acclaimed history of the Battle of the Atlantic during World War Two (OUP 2016), Jonathan Dimbleby now offers a compelling account of the largest military operation not only of World War Two but of all time--the invasion of Russia by Nazi Germany in 1941. Often seen as the turning point of the war in Europe, Operation Barbarossa turned allies into mortal enemies, triggering the atrocities that would characterize the Holocaust. Historians have spent generations puzzling over Barbarossa. For Hitler and the other Nazi leaders, who began planning the invasion even as the pact with the Soviets was in full force, the invasion would annihilate communism, eradicate inferior races, and provide the German people (and military) with resources that would guarantee not just survival but global domination. What followed was catastrophe. Between June, when the invasion began, and December 1941, when it stalled, some six million men were killed, wounded, or registered as missing in