Many historians claim that the Battle of Stalingrad was a turning point in the Second World War. The victory was taken by the Soviet Union, and the battle ended on February 2, 1943, when General Paulus surrendered with the remaining 91,000 soldiers. The significance of the victory of the Soviets in this battle is that it marked the end of the German army's advance to the east and further in Russia, and that was Germany's first major loss.
The answer is: Soviet Union