Battle of Tenochtitlán, (May 22–August 13, 1521), military engagement between the Aztecs and a coalition of Spanish and indigenous combatants. Spanish conquistadores commanded by Hernán Cortés allied with local tribes to conquer the Aztec capital city of Tenochtitlán. Cortés’s army besieged Tenochtitlán for 93 days, and a combination of superior weaponry and a devastating smallpox outbreak enabled the Spanish to conquer the city. Cortés’s victory destroyed the Aztec empire, and the Spanish began to consolidate control over what became the colony of New Spain.
At the beginning of the 16th century, the Aztecs controlled a vast amount of territory containing