Korchagin took command of the 2nd Mechanized Corps in September and was promoted to lieutenant general of tank troops on 18 January 1943. He led the corps during Operation Kutuzov, in which the corps was converted into the 7th Guards Mechanized Corps in recognition of its performance. It recaptured Sevsk, Oryol, and Mtsensk during the offensive, and from September 1943 advanced into Left-bank Ukraine as part of the 60th Army. Among the fortified points recaptured was Nezhin and on 25 September the corps crossed the Dnieper north of Kiev, capturing and holding a bridgehead on the right bank. For his leadership of the corps, which included personally supervising the Dnieper crossing, Korchagin received the title Hero of the Soviet Union and was awarded the Order of Lenin on 17 October 1943. The corps subsequently fought in the Lower Silesian Offensive, the Upper Silesian Offensive, the Berlin Offensive, and the Prague Offensive in 1945 under Korchagin's command.