Hitler's decision to attack the Soviet Union is often considered to be one of the wost decisions ever made by anybody.
The attack on the Soviet Union was sneaky and rather dastardly. Hitler had signed a non-aggression pact with the Soviets only two years previously.
As a result the Russians had not armed themselves for war and posed no threat to Nazi Germany.
At the end of the war, the Soviets forced the Nazis out of their territory. The Battle of Stalingrad turned the tides of war.
The Soviet Union was a major player in the downfall of Nazi Germany. Had Hitler never angered the Russian bear there was a good chance that he might never have been defeated by the Allies at all.
