Speaking of the Nazi invasion of the Soviet Union in 1941...I've never seen that as a mistake. The Soviets were in the midst of a massive rebuilding program and at the same time were very weak in leadership due to the Stalin purges of the '30's. If a more consistent and less ambitious plan had been followed, the Soviets would've been in more serious trouble than they were historically. But....
.....let's look at the flip-side of that conflict. Despite the obvious German build-up, and advance warning from numerous sources, Stalin refused to believe that Hitler would attack. The result was one of the major military blunders in history.
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