By the time the German 6th Army surrendered at Stalingrad, the Red Army aggressively pursued the remnants of Army Group Don, now renamed Army Group South, further west. Soviet units recaptured Kharkov and were approaching the Dniepr River. However, the commander of Army Group South, F.M. von Manstein marshaled forces for a counterattack in March 1943 that stabilized the southern wing of the Eastern Front until the Battle of Kursk in July 1943.