The Ordnance BL 15-inch howitzer was developed by the Coventry Ordnance Works late in 1914 in response to the success of its design of the 9.2-inch siege howitzer. The howitzer was cumbersome to deploy, since it was transported in several sections by giant Foster-Daimler tractors. Service history The weapon was operated by Royal Marine Artillery detachments of the Naval Brigade, with one gun per battery. One gun was sent to Gallipoli but not used there. They were later transferred to the British Army. It was used at the Battle of the Somme in September 1916 and at the Battle of Passchendaele, also known as the Third Battle of Ypres, in October 1917. It operated successfully where it was needed to destroy deep fortifications on the Western Front, but was limited by its relatively short range compared to other modern siege howitzers. The size and weight made it difficult to move and emplace. No further development occurred after the first batch of twelve, and instead Britain continued to develop and produce the 12-inch howitzer and 12-inch railway howitzer. Image gallery See also List of siege artillery Weapons of comparable role, performance and era Škoda 380 mm Model 1916 howitzer Austro-Hungarian equivalent Notes and references Bibliography Dale Clarke, British Artillery 1914–1919. Heavy Artillery. Osprey Publishing, Oxford UK, 2005 I.V. Hogg & L.F. Thurston, British Artillery Weapons & Ammunition 1914–1918. London: Ian Allan, 1972. Winston S. Churchill. The World Crisis, Part 2, 1915. (New York: Rosetta Books, 2013), Kindle. Film clip showing Royal Marine Artillery crew loading and firing the howitzer during the Battle of the Somme BL 15 inch Siege Howitzer at Landships World War I artillery of the United Kingdom World War I howitzers Siege artillery 380 mm artillery Coventry Ordnance Works