Tanks in World War II

This article deals with the history of the tank in World War II.

Overview

Tanks played a major role in World War II. The tank reached new heights of capability and sophistication. The early tanks of Germany were technologically inferior to many of their opponent's tanks in the areas of armour and firepower. It was in their tactical employment that German tanks dominated all rivals early in the war. German doctrine stressed the use of combined-arms involving mobile infantry and air support, and, after its surprising success during the execution of Fall Gelb (Battle of France), the tactic of the Blitzkrieg (lightning warfare). This doctrine required the Germans to equip their tanks with radios, which provided unmatched command and control. In contrast, almost all light French tanks lacked radios, essentially because their battle doctrine was based on a more slow-paced, deliberate conformance to planned movements. This required fewer radios at all levels. French tanks generally outclassed German tanks in firepower and armour in the 1940 campaign, but their poor command and control doctrine made these advantages irrelevant to the final outcome.

Just as in World War I, there was experimentation with effective tank sizes. On the heavy side, the United States experimented with the T-28 at 95 tons and Germany developed the 188-metric ton Panzer VIII Maus, though neither entered service. The trend towards heavier tanks was unmistakable as the war proceeded. In 1939, most tanks had maximum armour of 30 mm or less, with guns no heavier than 37-47 mm. Medium tanks of 1939 weighed around 20 tons. By 1945, typical medium tanks had maximum armour over 100 mm thick, with guns in the 75-85 mm range and weights of 30 to 45 tons. Light tanks, which dominated most armies early in the war, gradually faded out and were used only in very limited roles.

Turrets, which had always been considered, but were not previously a universal feature on tanks, were recognised as essential. It was appreciated that if the tank's gun was to be used to engage both 'soft' (unarmored) and armoured targets, then it needed to be as large and powerful as possible, making one large gun with an all-round field of fire vital. Also, mounting the gun in a turret ensured that the tank could fire from behind some cover. Hull-mounted guns required that most of the vehicle be exposed to enemy fire. Multiple-turreted or multi-gun designs such as the Soviet T-35, American Medium Tank M3, French Char B or British A9 Cruiser Mk I slowly became less common during World War II. It was recognized that a tank crew could not effectively control the fire of several weapons; also, newer dual-purpose guns eliminated the need for multiple weapons. Most tanks still retained a hull machine gun, and usually one or more machineguns in the turret, to protect them from infantry.

It was during this war that tanks usually began to be equipped with radios, vastly improving their command and control. By 1943, two-way radio was nearly universal. Tanks were adapted to a wide range of military jobs, including mine clearance and engineering tasks. Specialized models, such as flame-thrower tanks, recovery tanks for towing disabled tanks, and command tanks with extra radios and dummy turrets were also used. Some of these tank variants live on as other classes of armoured fighting vehicle, no longer called "tanks". All major combatant powers also developed tank destroyers and assault guns - armoured vehicles carrying large calibre guns, but often no turrets. Turreted vehicles are expensive to manufacture compared to nonturreted vehicles. One trend seen in World War II was the usage of older, lighter tank chassis to mount larger weapons in fixed casemates as tank destroyers or assault guns. For example, the Soviet T-34 could mount an 85 mm gun in the turret, but the same chassis could carry the much more effective 100 mm gun in a fixed casemate as the SU-100. Likewise, the obsolete German Panzer II light tank was modified to take a powerful 75 mm PAK-40 gun in an open-topped, fixed casement as the Marder II.

Germany

Main article: German tanks in World War II

Germany's armoured Panzer force was not especially impressive at the start of the war. Plans called for two main tanks: the Panzer III medium tank and the Panzer IV infantry tank. However, by theased.

During the Operation Barbarossa, the German invasion of the Soviet Union in 1941, it was discovered that the Soviet T-34 tank outclassed the Panzer III and IV. Its sloped armour could defeat most German weapons, and its 76.2 mm gun could penetrate the armour of all German tanks. This forced the Germanss. This included the Panzer V Panther, which was intended to be the new main German battle tank, but did not enter production before the war ended. The Germat was put into operational use. Being obsessed with very heavy and mighty tanks Hitler ordered even heavier and stronger tanks to be produced, which led to the development of the heavy Tiger II, which replaced the Tiger I late in the war. Its powerful gun and very heavy armor made it superior to every Allied or Soviet tank in a head-to-head confrontation, but the underpowered engine and the enormous fuel consumption limited its use in maneuver warfare. Ri

United Kingdom

A Mk IV Churchill (A22) Infantry Tank

Britain had been the worldwide trend-setter in tank development from 1915, but had lost its leadership position as the war approached. The British Army entered the war with an array of poor designs and hobbled by poor doctrine. British tank use focused on cavalry-type missions and infantry support without the focus on the combined-arms tactics that dominated German and Soviet thinking. The result was a series of under-armed, mechanically unreliable designs such as the A9, A10 and Crusader (A15) cruiser tanks, the Matilda (A11) and Matilda II (A12) infantry tanks, and a series of deathtrap light tanks suitable for reconnaissance work only. The few bright spots of British tank design included the Valentine, Churchill (A22), Cromwell (A27M), and Comet I (A34). The Valentine was a reliable, heavily-armoured infantry-support tank used successfully in the desert and by the Red Army as a light tank. The Churchill had heavy armour and good off-road capability. The Cromwell was in most respects the equal of the early model Sherman of the United States or the German Panzerkampfwagen/Pzkw-IV, but was fielded only in small numbers beginning in 1944. The Comet was an excellent design fielded in the final months of the war.

Beginning about mid-1942, most British tank units were equipped with vehicles supplied from the United States, such as the Stuart light tank, the Lee (or the Grant variant thereof) and the Lee's/Grant's replacement the Sherman.

Immediately before and during the war, the British produced an enormous array of prototype tanks and modified tanks for a variety of specialist tasks (see Hobart's Funnies). For example, the Churchill AVRE mounted a 290 mm (11.4") direct-fire mortar which was used for destroying buildings and clearing obstacles.

Soviet Union

The Soviet Union began and ended the war with more tanks than the rest of the world combined. How ever at the start of world war two most of these tanks were obsolete. The most common tank in Soviet service in 1941 was the T-26. Most T-26s were armed with a 45 mm gun capable of penetrating most German tanks at normal combat ranges; few had radios, and the design was mechanically sound although incapable of further development. The BT tank series, based on the Christie suspension system, were usually armed with the same 45 mm gun and were the most mobile tanks in the world. Close-support versions of both tanks existed, armed with 76.2 mm howitzers. However, the BT was at the end of its design life. The Red Army also fielded thousands of light recon tanks such as the amphibious T-37 and T-38. These had limited combat value; although highly mobile, they were armed only with 7.62 mm machine guns and had very thin armour. The Red Army also had about 400 T-28 medium tanks, which were in most respects equal to the German Pzkw-IV. Again, though, this design dated from 1931 and was obsolescent. The Soviet Union ended the 1930s with a fleet of tanks almost completely derived from foreign designs, but later developed some of the most important trend-setting tanks of the war. The problem the Soviet tank force faced in 1941 was not primarily the technical quality of its vehicles, but the very poor state of maintenance, the appalling lack of readiness, and the poor command situation brought on by the purges. The Red Army had in 1940 adopted an advanced doctrine that it was simply incapable of executing.

On the eve of war, the Red Army had embarked on two closely-related projects to reorganize its mechanized forces and re-equip them with modern designs incorporating the lessons of the Spanish Civil War and the Finnish Winter War. Some of these designs leapfrogged other countries' tank designs.

Several excellent designs were just entering production in 1940-41. The most significant was the T-34, originally designed as the successor to the BT series, but with its heavier armour and heavy dual-purpose gun it became the best medium tank of the first half of World War II. The T-34 eventually replaced almost all other Soviet tanks. The basic design was good enough to keep it battleworthy beyond 1945, having been upgraded with heavier guns, new turrets and other modifications. The other significant design was the KV series tanks. These were armed with the same excellent 76.2 mm gun as the T-34, and had the same V-2 diesel engine. However, the KV had torsion bar suspension and much heavier armour than the T-34. The KV was slow, intended as a breakthrough tank. The KV-2 close-support version was armed with a 152 mm howitzer. The KV series was the main Soviet heavy tank until 1943, when production ended and most had been expended. Early in 1944 the KV's successor was the IS-2 Iosif Stalin tank, armed with a 122 mm gun and with heavier armour and better mobility. The new Infantry-support tank of 1941 was the T-50, armed with a 45 mm gun but with torsion-bar suspension and excellent armour for its class. Production problems with its new engine led to the tank being cancelled after less than 70 had been made; however, it was intended to be the replacement for the T-26. Finally, the light reconnaissance role was to be filled by the amphibious T-40 and the cheaper non-amphibious T-60.

At the beginning of Germany's Operation Barbarossa most of the Soviet Union's tank forces were composed of the T-26 tank series and BT. A few T-40s had appeared, along with about 1363 mechanically unreliable early T-34 tanks, and 677 KV-1 and KV-2s. Many early T-34s were captured or destroyed. Much of this early failure was due to lack of coordination, ill-supplied and ill-trained tank crews, and the lack of readiness of the Red Army in general. Another difficulty for the T-34 was that it had only a four man crew, with the tank commander doubling as the gunner. Although spared from loading duties, as French tank commanders had been, it still crippled the tank commander's ability to maintain awareness of the battlefield while firing the tank's main gun, giving a tactical advantage to German armour.

In 1941 great numbers of T-60s appeared, supplemented in 1942 with the similar T-70. Both light tanks had torsion-bar suspension, light armour, and small truck engines. Their simple construction kept them in production even though their combat value was limited. The T-60 had only a 20 mm gun while the T-70 had a 45 mm. However, both had one-man turrets, making them difficult to crew effectively. The T-70 formed the basis for the much more important self-propelled gun SU-76 later in the war.

The T-34, however, effectively made all German tanks produced to that date obsolete. In fact, at its height the T-34 was deemed so successful, and so capable in every role, that production of all other tanks except the IS-2 was stopped to allow all available resources to be used exclusively for this tank. The T-34 forced the Germans to adopt new, heavier designs such as the Panther and Tiger, which in turn forced upgrades to the Soviet, United States and British tank fleets. Perhaps more significantly to the ultimate course of the war, the move to more complex and expensive German tank designs overwhelmed the already critically strained German tank-production capability, reducing the numbers of tanks available to German forces and thus helping to force Germany to surrender the initiative in the war to the Allies.

Mid-war, the KV series began to show its flaws. Better German antitank guns made it vulnerable, and its slow speed and lack of mechanical reliability were great handicaps. As it only carried the same gun as the T-34 but in a slower, much more expensive chassis, production was stopped in 1943.

Later in the war the light tank role was increasingly filled by Lend-Lease supplies of United States M-3 light tanks and British and Canadian Valentine tanks. Ironically, the T-34 was as fast or faster than many of the light tanks that were supposed to scout for it, further encouraging reductions in Soviet light tank production.

In response to better German tanks, the Soviets began to produce the T-34-85, which had an 85-mm gun, in the winter of 1943-44, while retaining superiority in speed and mobility over the German tanks—an advantage it enjoyed until the very end of the war. This model also had a much larger turret with a 3-man crew, finally allowing the tank commander to concentrate fully on maintaining a tactical awareness of the battlefield. The Soviets also responded with the 122 mm-armed IS-2 heavy tank, which carried heavier armour than the KV without an increase in overall weight; this was achieved by thinning the rear armour and moving most of the armour to the front of the tank, where it was expected to take most of its hits.

The IS-3 variant, produced in mid-1945, had a much more streamlined look and a larger, bowl-shaped tapered turret. Remarkably, the IS-3 had thicker armour but actually weighed slightly less than the IS-2, remaining under 50 tons (as compared to the Tiger II's 68). The armour design of the IS-3 was an enormous influence on postwar tank design, as seen in the Soviet T-55 and T-62 series, the United States M48 and the Federal German Leopard.

Soviet tank production outstripped all other nations with the exception of the United States. The Soviets accomplished this through standardization on a few designs, generally forgoing minor qualitative improvements and changing designs only when upgrades would result in a major improvement.

United States

United States production equipped not only the American forces but the forces of France (after 1942), Britain and other Allied nations. Similarly to the Soviet Union, the United States selected a few good basic designs and standardized on those models. Given the lack of tank design and production experience, it is remarkable that the United States designs were as good as they were.

Prior to the entry of the United States in the war, the Army had only a few tanks. The Light Tank M2 series was the most important. These light tanks were mechanically very reliable, with good mobility. However, they had a high silhouette due to the use of radial aircraft engines. Only a few saw combat, on Guadalcanal. The Light Tank M3 series of 1941 was an improvement of the M2, with more armour and a 37 mm gun. The new medium tank just entering production in 1940 was the M2A1. This was a hopelessly poor design with thin armour, a high silhouette, a 37 mm main gun and seven machine guns.

From 1940 new tank designs were prepared. The Battle of France had shown the importance of medium tanks, and the United States Army had a requirement for a medium tank with a 75 mm gun, and developed the M4 Sherman tank, the most important tank of the war for the Western Allies.

The first tanks of the United States to fight in the war were the Light Tank M3 and Medium Tank M3 (the "Grant" version had a British-designed turret and a six-man crew; the "Lee" version retained the original turret and seven-man crew). They were deeply flawed in many ways, yet were the best tanks available to the Western Allies and were superior to most of their German counterparts in armour protection and firepower. The Light Tank M3 was about as well-armed as the British cruiser tanks in the desert, yet was much more reliable mechanically. Its 37 mm main gun was more powerful than the main guns carried by German reconnaissance tanks. The official name given to the Light Tank M3 was 'Stuart'; a nickname used was 'Honey'. The M3 and its improved derivative, the Light Tank M5 series, remained in service throughout the war. By 1943, its 37 mm gun made it a very dangerous tank to serve in, but no better replacement was available. The Light Tank T7 design was proposed as a successor in 1943, armed with a 57 mm gun and with better armour; however, the design was never standardized for production.

The appearance of the M3 Lee medium tank in the summer of 1942 finally gave the British a gun better than their 2-pounders and 6-pounders and capable of dealing with German tanks and towed anti-tank guns. Although the British 6-pounder (57 mm) gun had better armour penetration than the M-3's 75 mm, it fired a much smaller high-explosive warhead. The M3 could successfully attack German antitank guns that had previously taken a heavy toll of British tanks, and was reasonably effective against German tanks of the day.

When first fielded, the M3 was a match for German medium tanks, but it had the significant disadvantage of its 75 mm main armament being mounted in the hull. It had a fully-traversable turret with a 37 mm cannon as well, but the turret combined with a hull gun gave it a very tall profile. The United States 1st Armored Division also employed the M3 in Africa. It was a stopgap solution, never intended to be a design of major importance. In American and British service the M3 was phased out at the end of the North African campaign, but continued in service in the Red Army for some time, where its crews named it the name ‘grave for seven brothers’.

The most important American design of the war was the M4 Sherman medium tank. The M4 became the second-most-produced tank of World War II, and was the only tank to be used by virtually all Allied forces (thanks to the American lend-lease program). M4s formed the main tank of American, British, Canadian, French, Polish and Chinese units. The M4 was the equal of the German medium tanks, the Panzerkampfwagen/PzKpfw III and IV, at the time it first saw service in 1942. Over 4,000 Shermans were supplied to the Soviet Union, beginning in mid-1943. The M4 remained a match for its most common opponents (the Pzkw-IV and various German self-propelled guns) throughout the war, but by late 1943 the German Panther and Tiger I were grave threats. The Sherman had only one major flaw, which was to use petrol instead of diesel, giving the tank a tendency to explode after one hit.

Flawed United States armour doctrine played a major role in keeping the M4 undergunned in 1944-1945. The doctrine emphasized that tanks were to be used primarily for infantry support and exploitation, while the role of fighting tanks was to be carried out by the tank destroyer branch, armed with both towed and self-propelled guns such as the 3 inch Gun Motor Carriage M10. The 3" GMC M10 was thinly armoured, with an open-topped turret mounting a 3-inch gun that was very powerful by mid-war standards.

Technically, the M4's design was capable of handling larger guns than the 75 mm and 76 mm guns with which they left the factory. The M36 Jackson with the powerful 90 mm gun also entered service in the fall of 1944 and could penetrate the glacis of a Panther at 600 meters. The British fitted Shermans with the more powerful Ordnance Quick Firing 17 pounder gun, a variant known informally as the Firefly. Postwar, the Israeli Army mounted a 105 mm low-pressure anti-tank gun on the M4.

By the time of the Normandy campaign, the M4 had become the workhorse tank of the Allied forces. Some Shermans were equipped with the Duplex Drive system (Sherman DD), which allowed them to swim using a collapsible screen and inflated rubber tubes. Along with this were the M1 Dozer Blade (a Sherman with a bulldozer blade), the Sherman beach armored recovery vehicle (BARV), the Sherman T34 (which had a multiple rocket launcher installed above the turret), the POA-CWS-H5 (a Sherman with a flame-thrower), the Sherman Twaby Ark (which allowed the Sherman to act as a temporary bridge), and the Sherman Crab Mark I (a Sherman with a mine flail), as well as many other variants.

The United States also produced what is arguably the best light tank of World War II, the Light Tank M24. The M24 had torsion-bar suspension, high mobility, and a compact 75 mm gun. Ergonomically the tank was quite good also. However, the M24 did not appear in combat until December 1944 and equipped only a few units by the end of the war. Also near the end of the war the M26 Pershing heavy tank was deployed operationally. The Pershing was a very modern design with torsion-bar suspension, heavy armor, and an excellent 90 mm gun. However, it was somewhat underpowered, having the same Ford GAA engine as the M4A3. The M26 basic design was good enough to form the basis for all postwar American tanks through the end of the M60 series.

The superior German second-generation tanks were not matched until the end of the war, but the Germans had already lost the initiative by 1943. The sheer volume of American production, superior combined-arms tactics and German errors on all levels meant that American tanks generally prevailed. This was the converse of the same pattern seen at the beginning of the war, when weakly-armored and undergunned but ably handled German panzers crushed their much more powerful French, British and Soviet opponents in blitzkrieg attacks.

External links

• http://web.archive.org/web/20010710230433/www.wargamer.org/GvA/weapons/usa_guns7.html
• http://web.archive.org/web/20010420095140/www.wargamer.org/GvA/weapons/british_guns5.html

US Army tests Normandy 1944

• http://www.wargaming.info/armour06.htm