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Operation Barbarossa (German: Unternehmen Barbarossa) was the code name for Nazi Germany's invasion of the Soviet Union during World War II that began on June 22nd, 1941. Over 4.5 million troops of the Axis powers invaded the USSR along a 2,900 km (1,800 mile) front. It was the largest military offensive in history. In addition to the large number of troops, it also involved 600,000 motor vehicles and 750,000 horses. Planning for Operation Barbarossa started on December 18th, 1940; the secret preparations and the military operation itself lasted almost a year, from spring to winter 1941.