During the Russian-Finnish War the commander of the Soviet 7th Army General Meretshov made a request for a heavy armoured tank mounting a very large gun to destroy Finnish bunkers.
In responce the design engineers at the KTZ took the hull of the KV1 heavy tank and added a huge turret mounting a 152mm M10 Howitzer.

Despite its many flaws huge height, dangerously high centre of gravity highly dubious mechanical reliability and poor turret layout the KV2 was still a monsteron the battlefield, iit was a moving bunker with its arour vertually impregnable and its gun one of the largest ever mounted in a turreted AFV.

It's crews named it 'The Dreadnought' with good reason. On 23rd and 24th. June 1941 near the town of Rasssaynjay in Lithuania a single KV2 of the second tank division took position on a crossroad and held up the advance of the 6th Pz. Div, for two entire days.
Numerous attacks including a batttery of 50mm anti tank guns (which were destroyed by the KV2 at a 500 mtr distance.

A Flak 88 destroyed at 800 mtrs distance, plus attacked by a special engineer unit all attacked but all failed to silence the Russian tank.
105mm Howitzers were brought up and managed to hit a track which partially immobilised the KV2. Under the cover of a massed Panzer attack by nerly 50 Pz. II's and Pz38t plus a second 88mm was brought up and deployed finally managed to silence the KV2.
Even then German infantry had to throw grenades into the tank to kill the crew.

PS KV2 E
PS KV2 D
PS KV2 F
BA Berge 2 E
BA Berge 2 C
BA Berge 2 A
PS KV1 D
PS KV1 B

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PS KV1 F