British heavy tanks of the First World War information

British heavy tanks of WWI
British heavy tanks of WWI
	A British Mark I "male" tank near Thiepval on 25 September 1916, fitted with wire mesh to deflect grenades and the initial steering tail, shown raised. Photograph by Ernest Brooks
Type	Heavy tank
Place of origin	United Kingdom
Service history
In service	(Mk I) from 1916
Used by	United Kingdom (Mk I–IX); Germany (Mk IV); Japan (Mk IV); Russia (White movement) (Mk V); Soviet Union (Mk V); United States (Mk V, V, VIII); France (Mk V); Canada (Mk V, V*);
Wars	First World War; Russian Civil War; German Revolution of 1918–19;
Production history
Designer	William Tritton; Major Walter Gordon Wilson;
Designed	1915
Manufacturer	(Mk I) William Foster & Co. of Lincoln; Metropolitan Carriage, Birmingham;
Produced	(Mk I) 1916
No. built	150
Variants	Mark II, Mark III, Mark IV, Mark V, Mark V, Mark V*, Mark VI, Mark VII, Mark VIII, Mark IX, Mark X, Gun Carrier Mark I
Specifications (Tank, Mark I)
Mass	Male: 28 long tons (28 t); Female: 27 long tons (27 t);
Length	32 ft 6 in (9.91 m) with tail; 25 ft 5 in (7.75 m) without;
Width	13 ft 9 in (4.19 m) [male]; 14 ft 4+1⁄2 in (4.38 m) [female];
Height	8 ft 2 in (2.49 m)
Crew	8 (commander/brakesman, driver, two gearsmen and four gunners)
Armour	0.24–0.47 in (6–12 mm)
Main; armament	Male: Two Hotchkiss 6 pdr QF; Female: Four .303 in Vickers machine guns;
Secondary; armament	Male: Three .303 in Hotchkiss machine guns; Female: One .303 in Hotchkiss machine gun;
Engine	Daimler-Knight 6-cylinder sleeve-valve 16-litre petrol engine; 105 horsepower (78 kW)
Power/weight	Male: 3.7 hp/LT (2.7 kW/t); Female: 4.0 hp/LT (2.9 kW/t);
Transmission	primary gearbox: 2 forward and 1 reverse; secondary: 2 speeds;
Suspension	26 unsprung rollers
Fuel capacity	50 imperial gallons (230 L; 60 US gal) internal
Operational; range	23.6 miles (38.0 km) radius of action, 6.2 hours endurance
Maximum speed	3.7 mph (6.0 km/h) maximum

British heavy tanks were a series of related armoured fighting vehicles developed by the UK during the First World War. The Mark I was the world's first tank, a tracked, armed, and armoured vehicle, to enter combat. The name "tank" was initially a code name to maintain secrecy and disguise its true purpose. The tank was developed in 1915 to break the stalemate of trench warfare. It could survive the machine gun and small-arms fire in "no man's land", travel over difficult terrain, crush barbed wire, and cross trenches to assault fortified enemy positions with powerful armament. Tanks also carried supplies and troops.

British heavy tanks are distinguished by a rhomboidal shape with a high climbing face of the track, designed to cross the wide and deep trenches prevalent on the battlefields of the Western Front. Due to the height necessary for this shape, an armed turret would have made the vehicle too tall and unstable. Instead, the main armament was arranged in sponsons at the side of the vehicle. The prototype, named "Mother", mounted a 6-pounder (57 mm) cannon and a Hotchkiss machine gun at each side. Later, subtypes were produced with machine guns only, which were designated "Female", while the original version with the protruding 6-pounder was called "Male".

The Mark I entered service in August 1916, and was first used in action on the morning of 15 September 1916 during the Battle of Flers-Courcelette, part of the Somme Offensive.^[2] With the exception of the few interim Mark II and Mark III tanks, it was followed by the largely similar Mark IV, which first saw combat in June 1917. The Mark IV was used en masse, about 460 tanks, at the Battle of Cambrai in November 1917. The Mark V, with a much improved transmission, entered service in mid-1918. More than two thousand British heavy tanks were produced. Manufacture was discontinued at the end of the war.

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Ellis & Chamberlain 1969, p. 19.
^ Forty & Livesey 2012, p. 20.

[FOOTNOTEEllisChamberlain196919-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Ellis & Chamberlain 1969, p. 19.

[FOOTNOTEFortyLivesey201220-2] Forty & Livesey 2012, p. 20.

v t e History of the tank
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Country	Australia United Kingdom Cuba China Canada New Zealand Czechoslovakia France Germany Iran Iraq Italy Israel Japan Poland North Korea South Korea Soviet Union Spain Sweden United States Ukraine
Type	Light tank Medium tank Heavy tank Super-heavy tank Cruiser tank Flame tank Infantry tank Main battle tank Tank destroyer Tankette Assault gun Self-propelled anti-aircraft weapon Self-propelled artillery Self-propelled mortar Multiple rocket launcher

British heavy tanks of the First World War information

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