union militants. The Sheffield Trades Council organised a meeting in Sheffield in 1866 at which the United Kingdom Alliance of Organised Trades—a forerunner of the Trades Union Congress (TUC)—was founded. The 20th century to the present In 1914 Sheffield became a diocese of the Church of England, and the parish church became a cathedral. During the First World War the Sheffield City Battalion suffered heavy losses at the Somme and Sheffield itself was bombed by a German zeppelin. The recession of the 1930s was only halted by the increasing tension as the Second World War loomed. The steel factories of Sheffield were set to work making weapons and ammunition for the war. As a result, once war was declared, the city once again became a target for bombing raids. In total there were 16 raids over Sheffield, but it was the heavy bombing over the nights of 12 and 15 December 1940 (now known as the Sheffield Blitz) when the most substantial damage occurred. More than 660 people died and numerous buildings were destroyed. Following the war, the 1950s and 1960s saw many large scale developments in the city. The Sheffield Tramway was closed, and a new system of roads, including the Inner Ring Road, were laid out. Also at this time many of the old slums were cleared and replaced with housing schemes such as the Park Hill flats, and the Gleadless Valley estate. In February 1962, the city was devastated by the Great Sheffield Gale. Extremely localised high winds across the city, reaching up to , killed four people, injured more than 400, and damaged more than 150,000 houses across the city, leaving thousands homeless. Sheffield's traditional manufacturing industries (along with those of many other areas in the UK), declined during the 20th century. In the 1980s, it was the setting for two films written by locally-born Barry Hines: Looks and Smiles, a 1981 film that portrayed the depression that the city was enduring, and Threads, a 1984 television film that simulated a nuclear winter in Sheffield after a warhead is dropped to the east of the city. The building of the Meadowhall shopping centre on the site of a former steelworks in 1990 was a mixed blessing, creating much needed jobs but speeding the decline of the city centre. Attempts to regenerate the city were kick-started by the hosting of the 1991 World Student Games and the