A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and battlefield mobility provided by tracks and a powerful engine; their main armament is often mounted within a turret. They are a mainstay of modern 20th and 21st century ground forces and a key part of combined arms combat.
Modern tanks are versatile mobile land weapons platforms whose main armament is a large-calibre tank gun mounted in a rotating gun turret, supplemented by machine guns or other ranged weapons such as anti-tank guided missiles or rocket launchers. They have heavy vehicle armour which provides protection for the crew, the vehicle's munition storage, fuel tank and propulsion systems. The use of tracks rather than wheels provides improved operational mobility which allows the tank to overcome rugged terrain and adverse conditions such as mud and ice/snow better than wheeled vehicles, and thus be more flexibly positioned at advantageous locations on the battlefield. These features enable the tank to perform in a variety of intense combat situations, simultaneously both offensively (with direct fire from their powerful main gun) and defensively (as fire support and defilade for friendly troops due to the near invulnerability to common infantry small arms and good resistance against heavier weapons, although anti-tank weapons used in 2022, some of them man-portable, have demonstrated the ability to destroy older generations of tanks with single shots), all while maintaining the mobility needed to exploit changing tactical situations. Fully integrating tanks into modern military forces spawned a new era of combat called armoured warfare. Until the invention of the main battle tank, tanks were typically categorized either by weight class (ultralight, light, medium, heavy or super-heavy tanks) or doctrinal purpose (breakthrough-, cavalry-, infantry-, cruiser-, antinfantry-, antitank-, operational-, qualitative reinforcement-, combined arms-, special operations-, or reconnaissance tanks). Some are larger and more thickly armoured and with large guns, while others are smaller, lightly armoured, and equipped with a smaller calibre and lighter gun. These smaller tanks move over terrain with speed and agility and can perform a reconnaissance role in addition to engaging hostile targets. The smaller, faster tank would not normally engage in battle with a larger, heavily armoured tank, except during a surprise flanking manoeuvre.
Etymology The word tank was first applied in a military context to British "landships" in 1915 to keep their nature secret before they entered service.
Origins On 24 December 1915, a meeting took place at the Inter-Departmental Conference (including representatives of the Director of Naval Construction's Committee, the Admiralty, the Ministry of Munitions, and the War Office). Its purpose was to discuss the progress of the plans for what were described as "Caterpillar Machine Gun Destroyers or Land Cruisers." In his autobiography, Albert Gerald Stern (Secretary to the Landship Committee, later head of the Mechanical Warfare Supply Department) says that at that meeting:
Mr. (Thomas J.) Macnamara (M.P., and Parliamentary and Financial Secretary to the Admiralty) then suggested, for secrecy's sake, to change the title of the Landship Committee. Mr. d'Eyncourt agreed that it was very desirable to retain secrecy by all means, and proposed to refer to the vessel as a "Water Carrier". In Government offices, committees and departments are always known by their initials. For this reason I, as Secretary, considered the proposed title totally unsuitable. In our search for a synonymous term, we changed the word "Water Carrier" to "Tank," and became the "Tank Supply" or "T.S." Committee. That is how these weapons came to be called Tanks. He incorrectly added, "and the name has now been adopted by all countries in the world." Lieutenant-Colonel Ernest Swinton, who was secretary to the meeting, says that he was instructed to find a non-committal word when writing his report of the proceedings. In the evening he discussed it with a fellow officer, Lt-Col Walter Dally Jones, and they chose the word "tank". "That night, in the draft report of the conference, the word 'tank' was employed in its new sense for the first time." Swinton's Notes on the Employment of Tanks, in which he uses the word throughout, was published in January 1916. In July 1918, Popular Science Monthly reported:
Because a fellow of the Royal Historical Society* has unintentionally misled the British public as to the origin of the famous "tanks", Sir William Tritton, who designed and built them, has published the real story of their name ... Since it was obviously inadvisable to herald "Little Willie's" reason for existence to the world he was known as the "Instructional Demonstration Unit." "Little Willie's" hull was called in the shop orders a "water carrier for Mesopotamia"; no one knew that the hull was intended to be mounted on a truck. Naturally, the water carrier began to be called a "tank". So the name came to be used by managers and foremen of the shop, until now it has a place in the army vocabulary and will probably be so known in history for all time. (*F.J. Gardiner, F.R.Hist.S.) D'Eyncourt's account differs from Swinton's and Tritton's:
... when the future arrangements were under discussion for transporting the first landships to France a question arose as to how, from a security point of view, the consignment should be labelled. To justify their size we decided to call them 'water-carriers for Russia' —the idea being that they should be taken for some new method of taking water to forward troops in the battle areas. Lt.-Col. Swinton ... raised a humorous objection to this, remarking that the War Office pundits would probably contract the description to 'W.C.'s for Russia', and that we had better forestall this by merely labelling the packages 'Tanks'. So tanks they became, and tanks they have remained." This appears to be an imperfect recollection. He says that the name problem arose "when we shipped the first two vehicles to France the following year" (August 1916), but by that time the name "tank" had been in use for eight months. The tanks were labelled "With Care to Petrograd," but the belief was encouraged that they were a type of snowplough.
International
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