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The T-35 was the first Soviet heavy tank. It was produced because the Red Army wanted a vehicle that could break through heavy fortified defences.
The first prototype was produced in 1932 and it had one main turret with a 76.2 mm gun and four smaller turrets taken from the BT-2. Two with 37 mm guns and two with machineguns. Production models had turrets similar to the ones on the BT-5. These were equipped with 45 mm guns. Some models had flamethrowers intead of one of the 45 mm guns. One T-35 tank cost 525,000 rubles which is nine times more than a BT light tank. Only 61 were built.
The T-35 first was action against Finland in the Winter War. The 5th Heavy Tank Brigade with 62 T-35s fought against the Germans during Operation Barbarossa. This tank was replaced by the KV-1.