In the history of warfare, what was the largest invasion ever undertaken?

Answer: This was Operation Barbarossa, Germany’s invasion of the Soviet Union, launched on June 21, 1941, during World War Two. It involved 3.2 million men and 3350 tanks. Within three weeks of the attack the Soviet Union had lost two million soldiers, either killed or wounded. Germany’s failure to defeat Soviet forces in the campaign was a crucial turning point in the war.

Source: Operation Barbarossa: Hitler’s Invasion of Russia 1941 by Colonel David M. Glantz

More at: History

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