Battle of Stalingrad (aug 23, 1942 – feb 2, 1943)

Description:

A Russian victory over Germany in winter 1942–1943 and a major turning point in the war, which led to the ultimate defeat of the Germans in May 1945.
Although German forces led a strong attack into Soviet territory, a strategic counteroffensive by Soviet forces flanked and surrounded a large body of German troops, eventually forcing them to surrender.
As a result, the casualties amounted to around 2.2 million, making it the bloodiest battle that had ever taken place.

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