Operation Barbarossa: Hitler’s Biggest Mistake That Cost Germany World War II Operation Barbarossa was Adolf Hitler’s most catastrophic decision of World War II. On June 22, 1941, Nazi Germany launched the largest military invasion in human history by attacking the Soviet Union. What Hitler believed would be a quick and decisive victory turned into a brutal war of attrition that ultimately destroyed the German army and sealed the fate of the Third Reich. In this documentary-style video, we break

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