Answer:
The Battle of Stalingrad.
Explanation:
The Battle of Stalingrad was a 7 month long battle between Nazi Germany and the Soviet Union. Germany declared war on the Soviet Union in June 1941 and thus began Operation Barbarossa. Germany made its way to the Volga River and thus began the longest and bloodiest battle of WW2 took place. It was from August 1942 to February 1943 and took the lives of 2 million people including civilians.
