Overview: On June 22, 1941, Germany launched Operation Barbarossa, a savage and merciless attack on the Soviet Union, designed to obliterate the Red Army and massacre its population. Hitler's dream of overtaking Moscow and the nation appeared ready to become a reality, but Stalin's army and Mother Nature had other plans. Now, newly colorized film and amateur home movies provide an unprecedented inside look at this brutal conflict as the Nazi killing machine cut a bloody scar through the pages of history in the deadliest campaign ever fought.