Ten months later, Cortés came back to Tenochtitlan with more soldiers. They started a siege of Tenochtitlan, so that no food or supplies could get in. After 91 days, without any food, and with disease throughout the city, the new emperor Cuauhtemoc finally surrendered to the Spanish on August 13, 1521. The Spanish destroyed Tenochtitlan. The Aztec Empire had ended.