Kursk

The Soviets conclusively won the Battle of Stalingrad. One complete German army had been lost, along with about 500,000 Germans and Axis allies, seriously depleting the Axis strength in the east. With an Allied invasion of Europe clearly looming, Hitler realized that an outright defeat of the Soviets before the western Allies arrived had become unlikely, and he decided to force the Soviets to a draw.

In 1917 the Germans had built the famous Hindenburg line on the Western Front, shortening their lines and thereby increasing their defensive strength. They planned on repeating this strategy in Russia and started construction of a massive series of defensive works known as the Panther-Wotan line. They intended to retreat to the line late in 1943 and proceed to bleed the Soviets against it while their own forces recuperated.

In February and March 1943 German Field Marshal Erich von Manstein had completed an offensive during the Third Battle of Kharkov, leaving the front line running roughly from Leningrad in the north to Rostov in the south. In the middle lay a large 200 km wide and 150 km deep Soviet-held salient (bulge) in the lines between German forward positions near Orel in the north, and Manstein's recently captured Kharkov in the south.