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Developments on the Eastern Front also aided the success of the invasion. In early 1943 the Russians destroyed a German army at Stalingrad. The Germans tried to regain the initiative in the summer of 1943, attacking a Soviet-held salient near the Russian city of Kursk. In the largest tank battle known to history, they suffered a resounding defeat. Henceforth, they remained on the defensive, in constant retreat, while the Soviets advanced westward, retaking major portions of the Ukraine and White Russia during the fall and winter and launching an offensive around Leningrad in January 1944. By March 1944 Soviet forces had reentered Polish territory, and a Soviet summer offensive had prevented the Germans from transferring troops to France.