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IS-2 model 1945
IS-2 model 1943 (front) and IS-3 at the Great Patriotic War Museum, Minsk, Belarus
Specifications
Mass	46 tonnes
Length	9.90 m
Width	3.09 m
Height	2.73 m
Crew	4

JS-1 redirects here. There is also a hip-hop artist called DJ JS-1.

The Iosif Stalin tank (or IS tank, named after the Soviet leader Joseph Stalin), was a heavy tank developed by the Soviet Union during World War II. The tanks in the series are also sometimes called JS or ИС tanks.

The heavy tank was designed with thick armour to counter the German 88 mm gun, and a powerful gun that was effective against the new German Tiger and Panther tanks. It also served as a breakthrough tank, firing a heavy high-explosive shell that was useful against entrenchments and bunkers. The IS-2 was used as a spearhead in the battle for Berlin by the Red Army, when the war had reached its final stage.

Production history

The KV series of Soviet heavy tanks was criticized by their crews for their low mobility, and lack of any heavier armament than the T-34 medium tank. In 1942, this problem was partially addressed by the lighter, faster KV-1S tank. The KV series remained much more expensive than the T-34, without having greater combat power. The heavy tank program was nearly cancelled by Stalin in 1943. However, the German employment of large numbers of Panther and Tiger tanks at the Battle of Kursk in the summer of 1943 changed Soviet priorities. In response, the Soviet tank industry created the stopgap KV-85, and embarked on the KV-13 design program to create a tank with more advanced armour layout and a more powerful main gun. Because Marshal Kliment Voroshilov had fallen out of political favour, the new heavy tank series was named Iosif Stalin tank.

The IS-85 prototype was accepted for production as the IS-1 heavy tank, but discussions continued about the gun the tank should carry. Two candidate weapons were the A-19 122 mm gun and the BS-3 100mm gun. The 100mm gun (later adopted on the SU-100 tank destroyer and the T-55 tank) had superior armor penetration, but a less useful high-explosive round than the 122mm. Also, the 100mm gun was a relatively new weapon in short supply. Excess production capacity existed for the 122mm gun and its ammunition. Proving-ground tests showed that the A-19 could penetrate clear through the front and rear armour of the German Panther tank. The IS-122 prototype replaced the IS-85, and began mass production as the IS-2. The 85 mm guns could be reserved for the new T-34/85 medium tank, and the few IS-1s built were mostly rearmed before leaving the factory, and issued as IS-2s.

The main production model was the IS-2, with the powerful A-19. It was slightly lighter and faster than the heaviest KV model 1942 tank, with thicker front armour and a much-improved turret design. The tank could carry thicker armor than the KV series, while remaining lighter, due to the better layout of the armor envelope. The KV's armor was less well-shaped and featured heavy armor even on the rear, while the IS series concentrated the heaviest armor up front.

Early IS-2s can be recognized by the 'stepped' front hull casting with its small, opening driver's visor. There early tanks lacked gun tube travel locks or AA machineguns, and had narrow mantlets.

Later improved IS-2s (the model 1944), had a faster-loading version of the gun, the D25-T with a double-baffle muzzle brake and better fire-control. It also featured a simpler hull front without a "step" in it (using a flat, sloping glacis armour plate). Some sources called it IS-2m, but it is not to be confused with the official Soviet designation IS-2M for a 1950s modernization. Other minor upgrades included the addition of a travel lock on the hull rear, wider mantlet, and, on very late models, an AA machinegun.

In late 1944 the design was upgraded to the IS-3. This tank had improved armour layout, and a hemispherical cast turret (resembling an overturned "soup bowl") which was to be the hallmark of post-war Soviet tanks. Its pointed prow earned it the nickname Shchuka (Pike) from its crews. Its front hull armour was thicker than the IS-2's (200 mm versus 120 mm), although it weighed slightly less and stood 30 cm lower. The IS-3 came too late to see action in World War II. Though some older sources claim that the tank saw action at the end of the war in Europe, there are no official reports to confirm this. It is now generally accepted that the tank saw no action against the Germans, although one regiment may have been deployed against the Japanese in Manchuria.

File:IS-85 (IS-1) Serienmodell.jpg

File:IS-2-44.jpg

In 1952, a further development was put into production, the IS-10. Due of the political climate in the wake of Stalin's 1953 death, it was renamed T-10.

In the mid-1950s, the remaining IS-2 tanks (mostly model 1944 variants) were upgraded to keep them battleworthy. This upgrade produced the IS-2M, which introduced fittings such as external fuel tanks on the rear hull (the basic IS-2 had these only on the hull sides), stowage bins on both sides of the hull, and protective skirting along the top edges of the tracks. IS-3 was also slightly modernized as IS-3M.

Employment

The IS-2 first saw combat in the spring of 1944. IS-2s were assigned to separate heavy tank regiments, normally of 21 tanks each. These regiments were used to reinforce the most important attack sectors during major offensive operations. Tactically, they were employed as breakthrough tanks. Their role was to support Infantry in the assault, using their large guns to destroy bunkers, buildings, dug-in crew-served weapons, and other 'soft' targets. They were also capable of taking on almost any German AFV if the need arose. Once a breakthrough was achieved, lighter, more mobile T-34s would take over the exploitation.

The IS-2 weighed about the same as a German Panther, and was thus somewhat lighter than the German heavy tanks, the Tiger series. It was slightly lower than both. A major weakness was the two-part ammunition, which slowed the rate of fire considerably. A second weakness was the very limited ammunition supply of only 28 rounds. This was the price paid by the small size of the design.

The IS-3 first appeared to western observers at the Allied Victory Parade in Berlin in September 1945. By most accounts these tanks overawed the western powers, who responded with heavy tank designs of their own in the 1950s. A Regiment of IS-3s may have been deployed in Manchuria in 1945.

By the 1950s, the emergence of the main battle tank concept rendered heavy tanks obsolete. In the late 1960s, the remaining Soviet heavy tanks were transferred to Red Army reserve service and war stores. The IS-2 Model 1944 remained in active service much longer in the armies of Cuba, China and North Korea. A regiment of Chinese IS-2s was available for use in the Korean War, but saw no service there. Some Soviet IS-3s were dug in as fixed pillboxes along the Soviet-Chinese border. The IS-3 was used in the 1956 Soviet invasion of Hungary and the Prague Spring in 1968. It was supplied to Egypt, seeing action in the Six Day War, but by this time the concept of the heavy tank was showing its deficiencies.

Models

IS-1

1943 model armed with an 85 mm gun. When IS-2 production started, these were re-gunned with 122mm guns before being issued.

IS-100

A prototype version armed with a 100 mm gun; it went into trials against the IS-122 which was armed with a 122 mm gun. Though the IS-100 was reported to have better anti-armor capabilities, the latter was chosen due to better all-around performance.

IS-2

1943 production model, armed with A-19 122 mm gun.

IS-2 model 1944 (sometimes "IS-2m")

1944 improvement with D25-T 122mm gun, with faster-loading drop breech and new fire control, improved simpler hull front.

IS-3

1944 armour redesign, with new rounded turret, angular front hull casting, integrated stowage bins over the tracks. Internally identical to IS-2 model 1944, and produced concurrently. About 350 built during the war.

IS-4

1944 design, in competition against the IS-3. Longer hull and thicker armour than IS-2. About 250 were built, after the war.

IS-10

1952 improvement with a longer hull, seven pairs of road wheels instead of six, a larger turret mounting a new gun with fume extractor, an improved diesel engine, and increased armour. Renamed T-10.

See also

• The IS-1's predecessor was the KV series.
• Its successors were the T-10 and T-10M heavy tanks
• Assault guns on the IS chassis: ISU-152, ISU-122.
• List of Soviet tanks - covers all periods
• March of the Soviet Tankmen

References

• Perret, Bryan (1987). Soviet Armour Since 1945. London: Blandford Press. ISBN 0-7137-1735-1. {{cite book}}: Cite has empty unknown parameters: |coauthors= and |month= (help)
• Zaloga, Steven J. (1984). Soviet Tanks and Combat Vehicles of World War Two. London: Arms and Armour Press. ISBN 0-85368-606-8. {{cite book}}: Cite has empty unknown parameter: |month= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

External links

• AFV Interiors
• Battlefield.ru: Development history, Combat employment, Comparison to German tanks, Detailed interior view, Last Heavy Tanks of the USSR (IS-4 through IS-10, or T-10)
• OnWar: IS-1, IS-2, IS-3
• IS-2M Photobook (PDF)
• M.Baryatinsky. History of IS-2 tanks (Russian)

• Heavy tanks
• World War II Soviet tanks
• Cold War Soviet tanks