By 1941 Belfast was making a hugely significant contribution to the British war effort, a fact, which did not go on unnoticed by the Germans. During the war, Belfast built 140 ships, ten percent of the merchant shipping of the United Kingdom. The city and province also manufactured guns, tanks, ammunition, aircraft (including 1,500 heavy bombers), two million parachutes, 90% of the shirts required by the armed forces and one-third of the ropes required by the War Office. All this made Belfast a glaringly obvious target for the Germans. The Luftwaffe made several attacks on Belfast with including an attack by 180 bombers on the night on 15th and 16th April 1941. The principal targets were the shipyard and the aircraft factory in east Belfast. East Belfast in general and Thorndyke Street in particular, as you can see from the mural did not escape the attention of the German bombers. Across Belfast 745 civilians were killed, 420 were seriously injured and more than 1,000 less seriously. April and May 1941 an estimated 56,000 houses were damaged, some 100,000 people were made temporarily homeless and a further 15,000 were deprived of their homes completely.