The Challenge Cup is a knockout cup competition for rugby league clubs organised by the Rugby Football League. Originally it was contested only by British teams but in recent years has been expanded to allow teams from France and Russia to take part. It has been held annually since 1896, with the exception of the duration of World War I and the 1939–1940 season, and involves amateur, semi-professional and professional clubs. For the 2013 competition, 96 teams entered the tournament. The final of the Challenge Cup is one of the most prestigious matches in world rugby league, and is traditionally held at Wembley Stadium, London. Despite London not being an area traditionally associated with rugby league, the final receives a lot of mainstream media coverage and is broadcast to many different countries around the world. Traditionally, “Abide With Me” is sung before the game, and has become something of a rugby league anthem. The current holders of the Challenge Cup are Leeds Rhinos who defeated Castleford Tigers 23-10 on 23 August 2014 at Wembley Stadium. Wigan Warriors are the most successful club in the history of the competition, winning the Cup a record 19 times.