remainder of the war. In the south: Operation Rumyantsev Operation Polkovodets Rumyantsev was intended as the main Soviet offensive for 1943. Its aim was to destroy the 4th Panzer Army and Army Detachment Kempf, and cut off the extended southern portion of Army Group South. After the heavy losses sustained by the Voronezh Front, during Operation Citadel, the Soviets needed time to regroup and refit, delaying the start of the offensive until 3 August. Diversionary attacks, launched two weeks earlier across the Donets and Mius Rivers into the Donbas, drew the attention of German reserves and thinned the defending forces that would face the main blow. The offensive was initiated by the Voronezh Front and Steppe Fronts against the northern wing of Army Group South. They drove through the German positions, making broad and deep penetrations. By 5 August, the Soviets had liberated Belgorod. By 12 August, the outskirts of Kharkov had been reached. The Soviet advance was finally halted by a counter-attack by the 2nd and 3rd SS Panzer Divisions. In the ensuing tank battles, the Soviet armies suffered heavy losses in armour. After this setback, the Soviets focused on Kharkov. After heavy fighting the city was liberated on 23 August. This battle is referred to by the Germans as the Fourth Battle of Kharkov, while the Soviets refer to it as the Belgorod–Kharkov offensive operation. Results The campaign was a strategic Soviet success. For the first time, a major German offensive had been stopped before achieving a breakthrough; the maximum depth of the German advance was in the north and in the south. The Germans, despite using more technologically advanced armour than in previous years, were unable to break through the deep Soviet defences and were caught off guard by the significant operational reserves of the Red Army. This result changed the pattern of operations on the Eastern Front, with the Soviet Union gaining the operational initiative. The Soviet victory was costly, with the Red Army losing considerably more men and materiel than the German Army. The Soviet Union's larger industrial potential and pool of manpower allowed them to absorb and replace its losses. Guderian wrote: With victory, the initiative firmly passed to the Red Army. For the remainder of the war the Germans were limited to reacting to Soviet advances, and were never able to regain the initiative or launch a major offensive on the Eastern Front.