In late August of 1552 Ivan took his army of 100,000 troops took over the town of Kazan by force. In 1556 his army also took control of Astrakhan. Its significant because after he won he was given the "terrible" part to his name. It also extended Russia to the Caspian Sea and to the Ural Mountains, adding nearly 1,000,000 square kilometers to Russia.(academic.mu.edu)(Andreyev 1).