Eastern Europe - Russian Leningrad and Ukraine Offensives - Operations 2 December 1943 to 30 April 1940

1943-12-02/1944-04-30

The Soviet multi-stage summer offensive started with the advance into the Orel salient. The diversion of the well-equipped Großdeutschland Division from Belgorod to Karachev could not counteract it, and the Wehrmacht began a withdrawal from Orel (retaken by the Red Army on 5 August 1943), falling back to the Hagen line in front of Bryansk. To the south, the Red Army broke through Army Group South's Belgorod positions and headed for Kharkov once again. Although intense battles of movement throughout late July and into August 1943 saw the Tigers blunting Soviet tank attacks on one axis, they were soon outflanked on another line to the west as the Soviet forces advanced down the Psel, and Kharkov was abandoned for the final time on 22 August.

Wikipedia: Eastern_Front_(World_War_II)