On [date], [X time] after first employing a nuclear weapon against the Wolf's Lair complex in Nazi Germany, the British Empire dropped a second atomic bomb, a plutonium-based implosion-type device with a yield of around 20 kt, on the city of Leningrad, in the Soviet Union. Approximately 75,000 people were killed by the blast and resulting firestorm, and as many as 150,000 injured. Among the casualties were thousands of soldiers from the 7th, 8th, 14th, and 23rd Armies as well as many thousands of civilians. Much of the city's historic centre was damaged or destroyed, as well as most of its hospitals and clinics. In the aftermath of the bombing, the Finnish I, II, and IV Corps moved in to occupy Leningrad, and subsequently took command of relief efforts. When Joseph Stalin did not respond to the Allies' call for surrender, a third atomic bomb was dropped [X] days later on the city of Mozhaysk.