The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long-lived light 57 mm naval guns introduced in 1885 to defend against new, small and fast vessels such as torpedo boats and later submarines. There were many variants produced, often under license which ranged in length from 40 to 58 calibers, but 40 caliber was the most common version.
Early Elswick gun on recoil mounting
Mark I Male tank with a long QF 6-pounder 8 cwt gun, at the Bovington Tank Museum.
Hotchkiss 6-pounder being prepared to combat at the USS Detroit (L'Univers Illustré, 1894).
Mk II Shell base, showing fuze hole
A tank gun is the main armament of a tank. Modern tank guns are high-velocity, large-caliber artilleries capable of firing kinetic energy penetrators, high-explosive anti-tank, and cannon-launched guided projectiles. Anti-aircraft guns can also be mounted to tanks.
L30 gun on a Royal Scots Dragoon Guards Challenger 2 tank.
French Saint-Chamond tank of 1917, with 75 mm gun in nose
Replica of German A7V "Wotan" showing 57 mm Maxim-Nordenfelt gun in front
British Mk II tank captured by German troops in April 1917, showing long 57 mm naval gun in side sponson
