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For the campaign against the Soviet Union, the Germans allotted almost 150 divisions containing a total of about three million men. Among those units were 19 panzer divisions, and in total the Barbarossa force had about 3,000 tanks, 7,000 artillery pieces, and 2,500 aircraft. It was in effect the largest and most powerful invasion force in human history. The Germans’ strength was further increased by more than 30 divisions of Finnish and Romanian troops.