The British Ordnance BL 9.2 inch gun on truck, railway mounted a variety of surplus 9.2 inch naval guns, together with the custom-designed Mk XIII railway gun, on various railway platforms to provide mobile long-range heavy artillery on the Western Front in World War I. Mk XIII remained in service for British home defence in World War II. History Second Boer War 1899-1902 A 9.2 inch railway gun was first deployed in 1900. The British mounted a 9.2 inch gun from the Cape Town coastal defences on a railway truck and sent it up the railway line to support the British assault on Boer defences at Belfast, north-east of Johannesburg. The battle ended on 27 August 1900 before the gun arrived, and as the Boers thereafter resorted to guerrilla warfare this innovation was not used in action during the war. World War I Early in 1915 a variety of surplus Mk III and Mk VI 9.2-inch naval and coast-defence guns were adapted by the Elswick Ordnance Company for mounting on railway trucks for use in France and Belgium. They were mounted on Vavasseur slides, which travelled backwards and upwards to absorb the recoil, on "well-based" trucks, where the base was level with the axles. These early mountings allowed 10° of traverse left and right, and moved forward and backwards along curved sections of track for further traversing. They limited elevation to 28° and hence limited maximum range. In March 1916 a modification increased elevation to 35°. In June 1916 Elswick produced a more sophisticated turntable mounting with a loading platform, on a "straight-back" truck which mounted the gun much higher. This was lowered to the ground for firing, had outriggers for stability, allowed 360° traverse and elevation to 30°. The more modern Mk X gun was mounted on this design, together with 2 Mk X variants intended for Australian coast defence (Mk XT), 4 Vickers 45-calibre guns (Mk XIV) which were originally intended for a foreign order, and a specially developed 35-calibres railway gun (Mk XIII). Mk XIII gun The custom-designed 35-calibres Mk XIII gun had a heavier breech which allowed the trunnions to be closer to the breech and hence the breech did not depress as far when the barrel was elevated. On a new Mk IV mounting, Mk XIII guns could then be elevated to 40° and attain a range of 22,600 yards. These remained in service until