Even though it had the largest army in the world , its troops were neither well equipped nor well trained.
The German invasion of the Soviet Union in 1941 succeeded in part because they attacked with no warning. The Soviet Union didn't have time to react to the German army's invasion.
Operation Barbarossa
June 22. 1941
The invasion of the Soviet Union had to specifically start in June, at the beginning of summer, as the extreme Soviet winters would have made an invasion impossible.
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The German invasion of the Soviet Union during WW2 was called Operation Barbarossa.
Hitler had not prepared for a long drawn-out campaign in the Russian winter, across such vast territory, and the sheer size of the Russian Army
The terrible winter weather
Germany : Operation Barbarossa was the German invasion of Russia .
The soviet union survived the invasion because they had enough people and resources to continue to fight. The leaders had no care for the people they were loosing in the war, and they were able to keep their industrial force by disassembling factories and moving them farther into the soviet union.
Besides Germans also people from Austria and former Czechoslovakia.