Motorcycle speedway first took place at Wembley in 1929, and operated until the outbreak of World War II in 1939, a few days before the 1939 World Championship Final was due to be held, but it was cancelled as a result of the war. The Wembley Lions returned in 1946 and operated in the top flight until the end of the 1956 season winning a number of League titles. A short lived revival saw the Lions in the British League in the 1970 and 1971 seasons.