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 his forces should take the strategic defensive. He anticipated that a Soviet offensive would attempt to cut off and destroy Army Group South by a move across the Donets River toward the Dnieper. In February, he proposed waiting for this offensive to develop and then delivering a series of counterattacks into the exposed Soviet flanks. Hitler, concerned about the political implications of taking a defensive stance, and preoccupied with holding the Donbass, rejected this plan. On 10 March, Manstein presented an alternative plan whereby the German forces would pinch off the Kursk salient with a rapid offensive commencing as soon