Battle of Kursk
The Battle of Kursk, (July 5–August 23, 1943) was an unsuccessful German assault on the Soviet positions around the city of Kursk, in western Russia, during World War II. The Battle of Kursk was the largest tank battle in history, involving some 6,000 tanks, 2,000,000 troops, and 4,000 aircraft. It marked the decisive end of the German offensive capability on the Eastern Front and cleared the way for the Soviet offensives of 1944–45.
The Soviet Union won in part through information on German war plans from the German resistance. See also National Socialist Germany and partisans/resistance movements: Internal German resistance movements.