Battle of Otumba. November 25, 1520. Cuitlahuac dies of smallpox. Cuauhtemoc becomes the new ruler of the Aztecs. Jul 1520-Apr 1521.
Spanish reinforcements arrive.
Construction of brigantines. Other Indian towns help the Spaniards. May 30, 1521. Beginning of the siege of Tenochtitlan. August 13, 1521.