https://en.wikipedia.org/wiki/Battle_...
In the Battle of Stalingrad (23 August 1942 – 2 February 1943), Germany and its allies fought the Soviet Union for control of the city of Stalingrad (now Volgograd) in Southern Russia. The battle was marked by fierce close-quarters combat and direct assaults on civilians in air raids. The Battle of Stalingrad was the deadliest battle to take place during the Second World War] and is one of the bloodiest battles in the history of warfare, with an estimated 2 million total casualties. The battle marked a turning point in the war as it forced the Oberkommando der Wehrmacht (German High Command) to withdraw considerable military forces from other theaters of war to replace their losses on the eastern front. The victory at Stalingrad energized the Red Army and shifted the balance of power in the favor of the Soviets.
The strategic importance of Stalingrad is difficult to overstate. Stalingrad was home to a major industrial and transport hub on the Volga River. More importantly whoever controlled Stalingrad would have access to the oil fields of the Caucasus; Germany, which was operating on dwindling fuel supplies, quickly realized this and Hitler promptly approved the invasion of Stalingrad. On 4 August, the Germans launched an offensive by using the 6th Army and elements of the 4th Panzer Army. The attack was supported by intense Luftwaffe bombing that reduced much of the city to rubble. The battle degenerated into house-to-house fighting as both sides poured reinforcements into the city. By mid-November, the Germans, at great cost, had pushed the Soviet defenders back into narrow zones along the west bank of the river.
On 19 November, the Red Army launched Operation Uranus, a two-pronged attack targeting the weaker Romanian armies protecting the 6th Army's flanks. The Axis flanks were overrun and the 6th Army was cut off and surrounded in the Stalingrad area. Adolf Hitler was determined to hold the city at all costs and forbade the 6th Army from attempting a breakout; instead, attempts were made to supply it by air and to break the encirclement from the outside. Heavy fighting continued for another two months. At the beginning of February 1943, the German forces in Stalingrad, having exhausted their ammunition and food finally capitulated, making it the first of Hitler's field armies to surrender during World War Two, after five months, one week, and three days of fighting.
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