In 1941 mainly in retaliation for the German bombing of Moscow, Joseph Stalin personally ordered the Soviet Air Force to bomb Königsberg. Eleven Pe-8 bombers attacked the city on 1 September 1941. The Soviets did not lose a bomber in the raid. The city was occasionally bombed again by the Soviet Air Force, like on 26 July 1942, 27 August 1942 or 15 July 1943. On 29 April 1943, the bombers dropped one 11,000 pounder on the city's area, the largest bomb in the Soviet inventory.