May 1521 – August 13, 1521

Cortés besieges Tenochtitlan, which falls on 13 August 1521

The siege begins in May 1521, with sources giving 10 or 22 May. After more than 90 days the Aztec defenders surrender on 13 August and Cuauhtémoc is captured. Estimates put Aztec dead at about 200,000.