On 10 May 1941, incendiary and high-explosive bombs were dropped on the Palace of Westminster, destroying the House of Commons Chamber and damaging the House of Lords Chamber, Westminster Hall and the Clock Tower. The air raid was part of the Luftwaffe’s (German Air Force) campaign of sustained aerial bombing attacks on Britain, known as the Blitz. The attack launched by the Luftwaffe on 10 May 1941 was its biggest air raid on London during the Second World War. It resulted in 1,436 civilian deaths, and caused damage to a number of other buildings including Westminster Abbey and the British Museum. As a result of the damage to the Commons chamber, between late June 1941 and October 1950, the House of Commons sat in the House of Lords Chamber, and the House of Lords sat in the Robing Room. The architect, Sir Giles Gilbert Scott, was appointed to design the overall architectural scheme and interior of the new Chamber, and it was officially opened by King George VI and Queen Elizabeth on 26 October 1950.