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 XLI Panzer Corps reached the heavily fortified small town of Ponyri, in the second defensive belt, which controlled the roads and railways leading south to Kursk. In the first day, the Germans penetrated into the Red Army lines for the loss of 1,287 men killed and missing and a further 5,921 wounded. Rokossovsky ordered the 17th Guards and 18th Guards Rifle Corps with the 2nd Tank Army and 19th Tank Corps, backed up by close air support, to counterattack the German 9th Army the following day on 6 July. However, due to poor coordination, only the 16th Tank Corps of