"History of the Imperial War Museum" The Vickers QF 13pdr Horse Artillery Gun of E Battery, Royal Horse Artillery, returns to the Imperial War Museum's building in South Kensington, after firing the salute at the funeral of Earl Haig, February 1928. During the First World War, the gun fired the first British round on the Western Front on 22 August 1914 and was also one of the last to fire before the Armistice came into force in 1918.