Battle of Kursk guns and mortars. In 1943 an offensive by the Soviet Central, Bryansk and Western Fronts against Army Group Centre was abandoned shortly after it began in early March, when the southern flank of the Central Front was threatened by Army Group South. Soviet intelligence received information about German troop concentrations spotted at Orel and Kharkov, as well as details of an intended German offensive in the Kursk sector through the Lucy spy ring in Switzerland. The Soviets verified the intelligence via their spy in Britain, John Cairncross, at the Government Code and Cypher School at Bletchley Park, who clandestinely forwarded
Battle of Kursk Kursk salient, along with the 36th Motorized Infantry, 18th Panzer and 20th Panzer Divisions were redeployed to face the Soviet spearheads. At around 04:00 on 5 July, the German attack commenced with a preliminary bombardment. Manstein's main attack was delivered by Hoth's 4th Panzer Army, which was organized into densely concentrated spearheads. Opposing the 4th Panzer Army was the Soviet 6th Guards Army, which was composed of the 22nd Guards Rifle Corps and 23rd Guards Rifle Corps. The Soviets had constructed three heavily fortified defensive belts to slow and weaken the attacking armoured forces. Though they had been provided superb