In conclusion, Operation Barbarossa was one of the greatest mistakes Hitler had made. It was the turning point of World War Two. Operation Barbarossa failed because Germany used weak military forces, had poor logistics and planning, and failed to win the Battle of Stalingrad, which is one of the main battles in Operation Barbarossa. The major problem that leads to the failure of this operation was the winter in Russia. That cause many major and minor problems such as weaker military forces, poor transportation. Russian army also has better equipment, gears, vehicles that suit the situation more. Second is that Germany has poor logistics and planning strategy. Germany has over underestimated Soviet Union, and their army, supplies were too confident. That leads to unrealistic, poor strategy and logistics. Finally, Germany lost the Battle of Stalingrad, which is a important major battle in Operation Barbarossa. German’s army was surrounded and Hitler makes the wrong call.