The IS tank family (IS in Cyrillic ИС meaning the Joseph Stalin or Iosif Stalin in Cyrillic Ио́сиф Ста́лин) was a series of heavy tanks developed as a successor to the KV-series by the Soviet Union during World War II. It was named after Soviet leader Joseph Stalin.The heavy tank was designed with thick armour to counter the German 88 mm guns and carried a main gun that was capable of defeating the German Tiger and Panther tanks.
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