Mark I tank

Mark I Tank
Mark I Tank
	; A British Mark I "male" tank near Thiepval on 26 September 1916, fitted with wire mesh to deflect grenades and the initial steering tail, shown raised. Photo by Ernest Brooks
Type	Tank
Place of origin	United Kingdom
Service history
In service	(Mk I) 1916-1918
Used by	United Kingdom (Mk I - IX); Germany (Mk IV); Imperial Japanese Army (Mk IV); White Movement (Mk V); Soviet Union (Mk V); United States (Mk V, V,VIII); France (Mk V); Canada (Mk V, V*); Estonia (Mk V); Latvia (Mk V)
Wars	First World War; Russian Civil War
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
Number built	150
Variants	Mark II, Mark III, Mark IV, Mark V series, Mark VI, Mark VII, Mark VIII, Mark IX, Mark X, Gun Carrier Mark I
Specifications
Weight	Male: 28 tons (28.4 tonnes); Female: 27.4 tonnes
Length	32 ft 6 in (9.94 m) with tail
Width	13 ft 9 in (4.33 m) [male]
Height	8 ft 0.5 in (2.44 m)
Crew	8 (commander, driver, two gearsmen and four gunners)

The British Mark I was a tracked vehicle developed by the British Army during the First World War, and the world's first combat tank. 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, of the Somme Offensive.^[1] Born of the need to break the domination of trenches and machine guns over the battlefields of the Western Front, it was the first vehicle to be named "tank", as an expedient to maintain secrecy and to disguise its true purpose.^[2] It was developed to be able to cross trenches, resist small-arms fire, travel over difficult terrain, carry supplies, and to capture fortified enemy positions. It is regarded as successful in many respects, but suffered from many problems owing to its primitive nature.

[edit] Development

Main article: History of the tank

The Mark I was a development of Little Willie, the experimental tank built for the Landships Committee by Lieutenant Walter Wilson and William Tritton in the summer of 1915. It was designed by Wilson in response to problems discovered during the development of Little Willie. A gun turret above the hull would have made the centre of gravity too high, so the guns were put in sponsons. The prototype Mark I, ready in December 1915, was called "Mother", (previous names having been "The Wilson Machine", "Big Willie", and "His Majesty's Land Ship Centipede"). One hundred and fifty of the Mark I were built.

[edit] Description

The Mark I was a rhomboid vehicle with a low centre of gravity and long track length, able to negotiate broken ground and cross trenches. Main armament was carried in sponsons on the hull sides.

The hull was undivided internally; the crew shared the same space as the engine. The environment inside was extremely unpleasant; since ventilation was inadequate, the atmosphere was contaminated with poisonous carbon monoxide, fuel and oil vapours from the engine, and cordite fumes from the weapons. Temperatures inside could reach 50 °C (122 °F). Entire crews lost consciousness inside the tank or, sometimes, collapsed when again exposed to fresh air.^[3]

To counter the danger of bullet splash or fragments knocked off the inside of the hull, crews were issued with leather-and-chainmail masks, and a leather helmet was also issued, to protect the head against projections inside the tank. Gas masks were standard issue as well, as they were to all soldiers at this point in the war (see Chemical warfare). The side armour of 8 mm initially made them largely immune to small arms fire, but could be penetrated by the recently developed armour-piercing K bullets. There was also the danger of being overrun by infantry and attacked with grenades. The next generation had thicker armour, making them nearly immune to the K bullets. In response, the Germans developed the 13.2 mm Mauser anti-tank rifle, and also a Geballte Ladung ("Bunched Charge")—several regular stick grenades bundled together for a much bigger explosion.

A direct hit by an artillery or mortar shell could cause the fuel tanks (which were placed high in the front horns of the track frames either side of the drivers' area, to allow gravity feed) to burst open. Incinerated crews were removed by special Salvage Companies, who also salvaged damaged tanks.

Steering was difficult, controlled by varying the speed of the two tracks. Four of the crew, two drivers (one of whom also acted as commander; he operated the brakes, the other the primary gearbox) and two "gearsmen" (one for the secondary gears of each track) were needed to control direction and speed, the latter never more than a walking pace. As the noise inside was deafening, the driver, after setting the primary gear box, communicated with the gearsmen with hand signals, first getting their attention by hitting the engine block with a heavy spanner. For slight turns, the driver could use the steering tail: an enormous contraption dragged behind the tank consisting of two large wheels, each of which could be blocked by pulling a steel cable causing the whole vehicle to slide in the same direction. If the engine stalled, the gearsmen would use the starting handle—a large crank between the engine and the gearbox. Many of these vehicles broke down in the heat of battle making them an easy target for German gunners. There was no wireless (radio); communication with command posts was by means of two pigeons, which had their own small exit hatch in the sponsons, or by runners. Because of the noise and vibration, early experiments had shown that radios were impractical, so lamps, flags, semaphore, coloured discs, and the carrier pigeons were part of the standard equipment of the various marks.^[4]

During the First World War, British propaganda made frequent use of tanks, portraying them as a wonder weapon that would quickly win the war. They were featured in films and popular songs.^[5]

[edit] Variants

A requirement was found for two types of armament, so 50% of Mark Is were armed with two 6 pounder guns and three 8 mm Hotchkiss machine guns, and called "Male", and 50% with four Vickers machine guns and one Hotchkiss, and called "Female". Swinton is credited with inventing the terms.^[6]

To aid steering, a pair of large wheels were added behind the tank. These were not as effective as hoped and were subsequently dropped.

The subsequent Mark II, III, IV, and V, and later tanks, all bear a strong resemblance to their "Mother".

[edit] Mark I

British Mark I tank with special camouflage scheme

Crew: 8
Combat Weight
- Male: 28 tons (28.4 tonne)
- Female: 27 tons (27.4 tonne)
Armour: .23-.47 in (6–12 mm)
Armament
- Male: two 6-pounder QF, three 8 mm Hotchkiss Machine Guns
- Female: four .303 Vickers Machine Guns, one 8 mm Hotchkiss Machine Gun

The Gun Carrier Mark I was a separate design, intended to carry a field gun or howitzer that could be fired from the vehicle. In service it was mostly used for carrying supplies and ammunition. Forty-eight were built.

[edit] Mark II

Mark II; tank no. 799 captured near Arras on 11 April 1917.

The Mark II incorporated minor improvements over the Mark I. With the Army declaring the Mark I still insufficiently developed for use, the Mark II order^[7] would continue to be built but it would be used for training only.^[8] As they were only to be used as training tanks they were supposedly clad in unhardened steel, though some doubt was cast on this claim in early 1917.^[9] Initially twenty were shipped to France and twenty-five remained at the training ground at Wool, Dorset in Britain; the remaining five were kept for use as test vehicles. As the promised MkIV tanks had not arrived by early 1917 it was decided, despite the protestations of Stern (see below), to ship the twenty-five training vehicles in Britain to France, ^[9] where they joined the other twenty MkIIs and fifteen MkIs in the Battle of Arras in April 1917. It is worth noting that the Germans were able to pierce the armour of both the MkI and MkII tanks at Arras with their armour-piercing machine gun ammunition.

The Mark II was built from December 1916 to January 1917 by Foster & Co and Metropolitan (25 Male and 25 Female respectively).^[10]

[edit] Mark III

The Mark III was a training tank, which used Lewis machine guns and a smaller sponson for the females. Fifty were built. It was originally intended that the Mark III have all the proposed new design features of the Mark IV. This is why there were two distinct training types, the Mark II being little more than a slightly improved Mark I. Development of the new features was so slow however, that the change from the Mark II was very gradual. The last two Mark III's were melted down in the Second World War. They did not see action overseas.

[edit] Mark IV

Main article: Mark IV tank

A female Mark IV tank C14. Photographed with German forces after the Battle of Cambrai. December 1917

Mark IV Female tank knocked out

Mark IV was an up-armoured version of the Mark I which went into production in May 1917. Fundamental mechanical improvements had originally been intended but these had to be postponed, the main change consisting in the switch to shorter-barrelled 6-pounder guns. It had all fuel stored in a single external tank (located between the rear track horns) in an attempt to improve crew safety. The sponsons could be pushed in to reduce the width of the tank for rail transportation. Rails on the roof carried an unditching beam. A total of 1,220 were built: 420 Males, 595 Females and 205 Tank Tenders, which were supply tanks.

The Mark IV was used successfully at the Messines Ridge in June 1917 where they outpaced the infantry on dry ground, but in the Third Ypres of July and August they found the swampy ground difficult and were of little use. About 432 Mark IV tanks were used during the Battle of Cambrai in November 1917.

The first tank-to-tank battle was between Mk IV tanks and German A7Vs in the Second Battle of Villers-Bretonneux in April 1918.^[11]

[edit] Mark V series

Main article: Mark V tank

Mark V "male" tank, showing short 6-pounder (57-mm) Hotchkiss gun in right sponson

The Mark V was first intended to be a completely new design of tank, of which a wooden mock-up had been finished. However, when the new engine and transmission originally destined for the Mark IV became available in December 1917, the first, more advanced Mark V design was abandoned for fear of disrupting the production run. The designation "Mark V" was switched to an improved version of the Mark IV, equipped with the new systems. The original design of the Mark IV was to be a large improvement on the Mark III but had been scaled back to be a mild improvement because of technical delays. The Mark V thus turned out very similar to the original design of the Mark IV - i.e. a greatly modified Mark III.

Four hundred were built, 200 each of Males and Females. Several were converted to Hermaphrodites (also known as "Composites") by fitting one male and one female sponson so that each tank had a 6-pounder. This measure was intended to ensure that female tanks would not be outgunned when faced with captured British male tanks in German use or the Germans' own A7V.

The Mark V was first used in the Battle of Hamel on 4 July 1918 when 60 tanks contributed to a successful assault on the German lines by Australian units. It took part in eight further major engagements during the War. A number saw service in the Allied intervention in the Russian Civil War on the White Russian side. Most were subsequently captured and used by the Red Army in the Russian Civil War. Four were retained by Estonian forces, and two by Latvia.

[edit] Mark VI

Main article: Mark VI (tank)

The Mark VI was one of a pair of related projects to develop the tank initiated in late 1916. The Mark V would be the application of as many advanced features as could be managed on the Mark I hull design and the Mark VI would be a complete break with the Mark I hull. The Mark V would not be built as such, because of the delays with the Mark IV and it would be a different Mark V that was built. The Mark VI project design had a completely new hull – taller and with rounded track paths. The single main gun was in the front of the hull. It did not progress past the stage of a wooden mock-up; the project was cancelled in December 1917 in order that a tank co-developed with the US (the Mark VIII) could go forward.

[edit] Mark VII

Mark Knothe, the Technical Liaison Officer between Stern, Elles and Anley, contributed to the development of the tank, designing a longer Mark I with Williams-Janney hydraulic transmission;^[12] one of the Mark IIs used as test vehicles had used a hydraulic transmission. In October 1917 Brown Brothers ^[13] in Edinburgh were granted a contract to develop this line of research further. In July 1918 the prototype was ready. Its drive system was very complex. The 150 hp Ricardo engine drove into Variable Speed Gear Ltd. pumps that in turn powered two hydraulic motors, moving one track each by means of several chains. To ward off the obvious danger of overheating there were many fans, louvres and radiators. Steering was easy and gradual however and the version was taken into production to equip one tank battalion. Three had been built, and only one delivered out of an order for 74 when war ended.^[12] It was passed over in favour over the V** which was ordered at the same time. The hull was slightly lengthened in comparison with the Mark V. No Mark VIIs survive.

[edit] Mark VIII

The Allied Mark VIII (Liberty) tank

Main article: Mark VIII (tank)

When Stern was removed from his post following disagreements with the war office, he was sidelined by appointment to a new department to work on a cooperative design between the Allies – assembly in France, hulls, guns and their ammunition from the UK and other components (principally the engines) from the USA^[14] American involvement in the development of the tank design led to the Mark VIII, also known as "Liberty" or Anglo-American tank (though initially the French were partially involved).

The engine was compartmentalised from the crew, and the turret structure included forward and rear firing machine guns. Of a planned (shared production) of 1,500 each, 24 were built by the British before they pulled out of the project and 100 completed by the Americans. The 100 were produced between September 1918 and 1920, at the Rock Island Arsenal, at a cost of $35,000 [£8,750] apiece ($430,000 [£226,000] in 2006). About 40 hulls for the U.S Liberty were produced by the Manchester Tank Syndicate, 11 British Type Mark VIII by the North British Locomotive Co.^[15]

They were used and upgraded until the 1930s when given to Canada for training (as opposed to the M1917s which were sold at scrap value). The tank itself was over 34 feet (10 m) long, and there had been an even longer 44 foot (13 m) version planned but never made (the Mark VIII*). The tank was outdated by the 1930s due to its speed (under 6 mph/10 km/h) and armour (16–6 mm) but it did have one of the longest independent trench crossing capabilities of any armoured fighting vehicle (AFV) ever made. Modern main battle tanks and AFVs rely on bridge laying tanks for crossing large deep trenches.

Crew: 12 (later 10)
Weight 37 tons (37.6 tonnes)
Length/Height/Width : 34 ft 2 in by 10 ft 3 in by 12 ft 4 in (10.4 m by 3.1 m by 3.8 m) (Mark VIII* length 44 ft/13.4 m)
Engine: Ricardo 330 hp petrol (UK), Liberty V12 300 hp (U.S.).^[15]

[edit] Mark IX

Main article: Mark IX tank

The Mark IX was a troop carrier or infantry supply vehicle—among the first tracked armoured personnel carrier not counting experiments with the lengthened Mk V's. 34 were built out of an order for 200.

[edit] Mark X

Paper only project to improve the Mark V, originally known as Mark V***. This was basically a contingency plan in case the Mark VIII project would fail (if so a production of 2000 was foreseen for 1919), trying to produce a tank with as many parts of the Mark V as possible but with improved manoeuvrability and crew comfort.

[edit] Combat history

A disabled Mark IV tank near Cambrai, 1917.

German forces using captured British Mark IVs during the Second Battle of the Marne.

The first tanks were added, as a "Heavy Branch", to the Machine Gun Corps until a separate Tank Corps was formed on 28 July 1917 by Royal Warrant. A small number of Mark I tanks took part in the battle of the Somme during the Battle of Flers-Courcelette in September 1916. They were used to cut through barbed wire to clear the way for infantry, and were even driven through houses to destroy machine gunner's emplacements.^[16] Although many broke down or became stuck, almost a third that attacked made it across no man's land, and their effect on the enemy was noted, leading to a request by the British C-in-C Douglas Haig for a thousand more. This came as a bit of a surprise: William Tritton had already started the development of a heavier tank: the Flying Elephant. Unfortunately for the Allies, it also gave the Germans time to develop a specifically designed anti-tank weapon for the infantry, an armour-piercing 7.92 mm K bullet.

During the Battle of Amiens in August 1918, several hundred Mark V tanks, along with the new Whippet and Mk V* tanks, penetrated the German lines in a foretaste of modern armoured warfare.

Mark V tanks captured by the Red Army from the White Army in the course of the Russian Civil War were used in 1921 during the Red Army invasion of Georgia and contributed to the Soviet victory in the battle for Tbilisi.^[17]

In 1945, Allied troops came across two badly damaged Mk V tanks in Berlin. Photographic evidence indicates that these were survivors of the Russian Civil War and had been previously been displayed in Smolensk before being brought back to Berlin after the German invasion of the Soviet Union in 1941. Accounts of their active involvement in the Battle of Berlin have not been verified .^[18]

A small number of MkI and Mk IV tanks were present at the Second Battle of Gaza and Third Battle of Gaza, respectively, in Palestine in 1917.

[edit] Surviving vehicles

[edit] Little Willie

Little Willie survives at the Bovington Tank Museum; it was saved from being scrapped in 1940—many other prototypes were melted down during the Invasion Scare—on the pretext it was helping to defend Bovington base against possible German attacks.