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The ISU-152 was armed with the same gun as the SU-152, but it used the hull of the IS-1 tank instead of the KV-1S. Later in the war the ISU-152 was further improved. It used the hull of the IS-2 or IS-2 model 1944 tank, the armour of the mantlet was increased, the gun was replaced by newer variants, a 12.7 x 108 mm DShK anti-aircraft machine gun was installed by the right forward hatch and later its ammunition capacity increased, the 10R radio set was upgraded to a 10RK and the fuel capacity was increased.

The crew were given two PPSh submachine guns with 1491 rounds and 20 F-1 grenades for short range self-defence.

Some ISU-152s were equipped with even larger external fuel tanks, two tanks on the rear hull deck, in addition to the four external fuel tanks (90 litres each, maximum), or with two smaller additional external fuel tanks, on the hull rear. This option was probably available for the post-war ISU-152 variants.

The ISU-152 self-propelled gun combined three battle roles: heavy assault gun, heavy tank destroyer and heavy self-propelled artillery. 

The 152.4 mm gun used a number of powerful (shell and charge) ammunition. Some of these ammunition had a 43.56 kg high-explosive shell, or a 48.78 kg armour-piercing shell, or the heaviest of all, the 53-G-545 (53-Г-545) long range concrete-piercing ammunition with a 56 kg shell. The ISU-152 was used for infantry and tank support, and attack on fortified positions in a direct fire role, for support on the battlefield in an indirect fire role, and for fight against tanks with a direct fire.

Between December 1943 and May 1945, 1,885 ISU-152s were built.

In June 1944, during the Continuation War, a captured ISU-152 was used by the Finnish military. It was abandoned during the counter-attack at Kärstilänjärvi after receiving numerous shots from Soviet T-34-85 medium tanks. This was a direct result of the Finnish crew's lack of experience and training with regard to the ISU-152. 

Another captured one was repaired in Varkaus, Finland, but it never saw combat action.

I don't know which one is of two ISU-152 captured for Finnish Army during World War II is this tank, maybe is not one of these two. Anyway is amazing watch this tank on display at Parola Armor Museum in Finland.


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