How large was the German invasion force used in Operation Barbarossa?

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Eastern Front Red Army soldier waving the Soviet flag during the Battle of Stalingrad.

For the campaign against the Soviet Union, known as Operation Barbarossa, the German military allotted almost 150 divisions, comprising a total of approximately three million men.12

This force was supported by:
* 19 panzer divisions12
* About 3,000 tanks12
* 7,000 artillery pieces12
* 2,500 aircraft12

In addition to these German units, the invasion force's strength was further bolstered by more than 30 divisions of Finnish and Romanian troops. This mobilization constituted the largest and most powerful invasion force in human history.12