Aware months in advance that the attack would fall on the neck of the Kursk salient, the Soviets built a defence in depth designed to wear down the German armoured spearhead. The Soviet government had foreknowledge of the German intentions, provided in part by British intelligence's Tunny intercepts. It was also hoped that large numbers of Soviet prisoners would be captured to be used as slave labour in the German armaments industry. Hitler believed that a victory here would reassert German strength and improve his prestige with his allies, who he thought were considering withdrawing from the war. The Germans hoped to weaken the Soviet offensive potential for the summer of 1943 by cutting off and enveloping the forces that they anticipated would be in the Kursk salient. On 3 August, the Soviets began the second phase of the Kursk Strategic Offensive Operation with the launch of Operation Polkovodets Rumyantsev ( Russian: Полководец Румянцев) against the German forces on the southern side of the salient.

On the southern side, the Soviets also launched powerful counterattacks the same day, one of which led to a large armoured clash, the Battle of Prokhorovka.

After the German offensive stalled on the northern side of the salient, on 12 July the Soviets commenced their Kursk Strategic Offensive Operation with the launch of Operation Kutuzov ( Russian: Кутузов) against the rear of the German forces on the same side. The battle began with the launch of the German offensive Operation Citadel ( German: Unternehmen Zitadelle), on 5 July, which had the objective of pinching off the Kursk salient with attacks on the base of the salient from north and south simultaneously. The Battle of Kursk was a major World War II Eastern Front large-scale engagement between the forces of Nazi Germany and the Soviet Union near Kursk in southwestern Russia during the late summer of 1943 it ultimately became the largest tank battle in history and resulted in a Soviet victory.

Largest tank battle in ww2 guam