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
Kursk a new fortress was built, in 1616 it was garrisoned by over 1,300 soldiers. At the beginning of the 17th century Kursk was repeatedly attacked by Polish-Lithuania (in 1612, 1616, 1617, 1634), the Crimean Tatars, and the Nogai horde, but Kursk fortress was never taken. Residents of Oryol and other southern Russian cities were resettled in Kursk (by 1678 2,800 had been resettled). The city developed due to its advantageous geographical position on the shortest route from Moscow to the Crimea and from Kiev to the Crimea. It was raided frequently by the Polish–Lithuanian Commonwealth and Crimean Khanate until the