The Mauser T-gewehr M-1918 (german: mauser PanzerGewehr M-1918) is the world's first anti-tank rifle[6]—the first rifle designed for the sole purpose of destroying armored targets—and the only anti-tank rifle to see service in World War I. Approximately 15,800 were produced.[2], During the First World War the onset of static, trench warfare saw the rise in the use of armour plate for personal defense, and the development and use of armour-piercing ammunition to counter this. Both Britain and Germany used high-powered rifles, such as elephant guns from their African colonies, for this purpose. The first use of armoured fighting vehicles (tanks) was by the British at the Battle of Flers–Courcelette in September 1916 and were followed by the French. By June 1917, the German Army faced the Mark IV tank, and found that the standard armour-piercing 7.92 mm K bullet was no longer effective. This prompted the development by the Germans of a heavy-calibre and high-velocity rifle as an anti-tank weapon. The makers of the gun were inspired by weapons used to hunt African big game, like the Elephant gun.[7] The Mauser Company responded with the 13mm T-gewehr and began mass production at Oberndorf am Neckar in May 1918. The first of these off the production lines were issued to specially raised anti-tank detachments.-wikipedia.