What did Stalin do that the Soviet army lost 4 million men within six months of the war between the Soviet Union and Germany?

What did Stalin do that the Soviet army lost 4 million men within six months of the war between the Soviet Union and Germany?
On June 22, 1941, the Soviet-German War broke out.

on June 22nd, 1941, German troops invaded the Soviet Union in three ways, and the Soviet-German War broke out.



first, Stalin's elimination of counter-revolutionaries seriously affected the combat effectiveness of the Soviet army.


second, Stalin himself was not vigilant enough about the German invasion of the Soviet Union.


third, there are problems with the deployment of Soviet troops.


fourth, Stalin made serious mistakes in command.


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