"The Battle of Stalingrad (23 August 1942 – 2 February 1943) was a major battle of World War II in which Nazi Germany and its allies fought the Soviet Union for control of the city of Stalingrad (now Volgograd) in the south-western Soviet Union.
Marked by constant close quarters combat and direct assaults on civilians by air raids, it was the single largest and bloodiest battle in the history of warfare. It was a turning point in the World War II–the German forces never regained the initiative in the East and withdrew a vast military force from the West to replace their losses".
From here