<Li> Mid-October to mid-December--Smallpox epidemic; death of Cuitlahuac on December 4, perhaps of smallpox </Li> <Li> Late December--Spanish - Tlaxcalan forces return to the Valley of Mexico; join with Texcocan forces of Ixtlilxochitl </Li> <Ul> <Li> Late January--Cuauhtemoc elected huey tlatoani of Tenochtitlan </Li> <Li> February--combined Spanish - Tlaxalan - Texcocan forces attack Xaltocan and Tlacopan; Texcoco become the base of operations for the campaign against Tenochtitlan </Li> <Li> Early April--attacks against Yautepec and Cuernavaca, following by sacking </Li> <Li> Mid-April--Combined forces defeated by the Xochimilcans, Tenochtitlan's ally </Li> <Li> Late April--Construction of 13 shallow - bottomed brigrantines by Tlaxalan laborers under Spanish supervision; mounted with cannon; launched into Lake Texcoco, allowing Spanish control of the inland sea </Li> <Li> May 10--Start of the siege of Tenochtitlan; potable water from Chapultepec cut off </Li> <Li> June 30--Defeat of Spanish - Tlaxcalan forces on a causeway; capture and ritual sacrifice of the Spaniards and their horses in Tenochtitlan </Li> <Li> July--Spanish ships land at Veracruz with large numbers of Spaniards, munitions, and horses </Li> <Li> July 20--25--Battle for Tenochtitlan </Li> <Li> August 1--Spanish - Tlaxcalan - Texcocan forces enter the Plaza Mayor; last stand of the Aztec defenders </Li> <Li> August 13--Surrender of Aztec defenders; capture of Cuauhtemoc </Li> <Li> August 13--17--Wholesale sacking and violence against the survivors in Tenochtitlan </Li> </Ul> <Li> Late January--Cuauhtemoc elected huey tlatoani of Tenochtitlan </Li>

Who was the final ruler of the aztec before the empire fell to the spanish