On the Soviet-German battlefield, many factors contributed to the Soviet victory. First of all, Germany is a war of aggression and unjust, so it was resisted by the Soviet people. In this war, the heroic Soviet people paid a huge price, but they never gave in, especially in the defense of Leningrad. At that time, the Soviet side was faced with problems such as bad weather, backward military equipment and lack of logistical support, but the Soviet people completely resisted for more than 900 days, making it impossible for the German army to make any further progress, which shows the heroic spirit of the Soviet people.

The second is timing. Winter in the Soviet Union is very cold. After the defeat of the German Blitzkrieg, the war was prolonged indefinitely, and the cold weather in winter caused great difficulties for the German army. Especially at that time, the raw material of German uniform buttons was tin. This substance will turn into powder in extreme weather, which makes it difficult for many Germans to button up their clothes. Not only can it not keep out the cold, but it will also affect combat operations. So many Germans froze to death, which greatly weakened their fighting capacity.

The third reason for the Soviet Union's victory is actually similar to China's victory over the Japanese invaders. That's the land area. Even if the Soviet Union was defeated for a while, the Germans could not occupy all the territory, so the Soviet army had great strategic depth. Moreover, at that time, Germany's goal was the whole of Europe, and its combat effectiveness was scattered. Soviet troops have always controlled most of the territory of the Soviet Union.

Finally, help from other countries. The war between the Soviet Union and Germany was not only a matter for the Soviet Union, especially after the outbreak of the Pacific War, the United States and Britain gave great support to the Soviet Union. After the October Revolution, the Soviet Union entered an industrialized society, and the entire industrial base of the Soviet Union was very perfect. Therefore, at the beginning of the war, the entire Soviet Red Army could be equipped. Although the industrial facilities were hit in the later period, the assistance from the United States and Britain continued, ensuring Soviet supplies and providing weapons. But Germany began to be short of materials, and finally it was difficult to continue to support the war.