One day after the first nuclear bomb, the soviet declared war on Japan and attacked Manchuria killing the rest of the Japanese soldier there. One day after the attack the second bomb was dropped.
The Nazi-Soviet Pact allowed the Germans to concentrate their forces on the Western front .
Battle of Stalingrad in around 1942-1943. They actually captured more Germans than 80,000 I think. I could be wrong so don't quote me on this :|