section_path: New World voyages and Treaty of Tordesillas/Conquest of the Aztec Empire
section_name: Conquest of the Aztec Empire
paragraph_text: Conquest of the Aztec Empire
  
  Defying the opposition of Diego Velázquez de Cuéllar, the governor of Hispaniola, Hernán Cortés organized an expedition of 550 conquistadors and sailed for the coast of Mexico in March 1519. The Castilians defeated a 10,000-strong Chontal Mayan army at Potonchán on 24 March and emerged triumphant against a larger force of 40,000 Mayans three days later. On 2 September, 360 Castilians and 2,300 Totonac Indian allies defeated a 20,000-strong Tlaxcalan army. Three days later, a 50,000-strong Otomi-Tlaxcalan force was defeated by Spanish arquebusier and cannon fire, and a Castilian cavalry charge. Thousands of Tlaxcalans joined the invaders against their Aztec rulers. Cortés's forces sacked the city of Cholula, massacring 6,000 inhabitants, and later entered Emperor Moctezuma II's capital, Tenochtitlan, on 8 November. Velázquez sent a force led by Pánfilo de Narváez to punish the insubordinate Cortés for his unauthorized invasion of Mexico, but they were defeated at the Battle of Cempoala on 29 May 1520. Narváez was wounded and captured and 17 of his troops were killed; the rest joined Cortés. The conquistadors now totaled 1,500 Spaniards, 90 horses, and 30 cannons. Meanwhile, Pedro de Alvarado triggered a Mexica uprising following the Massacre in the Great Temple of Tenochtitlan, during which 400 Mexica nobles and 2,000 onlookers were hacked and bludgeoned to death. The Castilians were driven out of the Aztec capital, suffering 450 dead, and losing all of their gold and guns during La Noche Triste.
  
  On 8 July 1520, at Otumba, the Castilians and their allies, without artillery or arquebusiers, repelled 100,000 Aztecs armed with obsidian-bladed swords. In August, 500 Castilians and 40,000 Tlaxcalans conquered the hilltop town of Tepeaca, an Aztec ally. The town and its surrounding area were ravaged, with most citizens either branded on the face with the letter "G" (for guerra) and enslaved by the Spanish, or sacrificed and eaten by the Tlaxcaltecans. By the spring of 1521, Cortés had formed a new invasion force. The new emperor, Cuauhtémoc, defended Tenochtitlan with 100,000 warriors armed with slings, bows, and obsidian swords. From 21 May to 1 June, the Spanish-Tlaxcalan forces swept the lake and ravaged the countryside. The first military encounter occurred after an advance along the causeway at Tlacopan by the armies of Alvarado and Cristóbal de Olid. While fighting on the causeway, the Spanish and their allies came under attack from both sides by Aztecs firing arrows from canoes. Thirteen Spanish brigantines sank 300 out of 400 enemy war canoes sent against them. The Aztecs tried to damage the Spanish vessels by hiding spears beneath the shallow water. The attackers breached the city and engaged in fighting with the Aztec defenders in the streets.
  
  The Aztecs defeated the Spanish-Tlaxcalan forces at the Battle of Colhuacatonco on 30 June 1521. Following their victory, 53 Spanish prisoners were paraded to the tops of Tlatelolco's highest pyramids and publicly sacrificed. In late July, the attackers resumed their assaults, resulting in the massacre of 800 Aztec civilians. By 29 July, the Spanish had reached Tlatelolco's center, raising their new flag atop the city's twin towers. Having exhausted their gunpowder, they attempted a catapult breach but failed. On 3 August, 12,000 more civilians were killed in another city section. Alvarado's destruction of the aqueducts forced the Aztecs to drink from the lake, causing disease and thousands of deaths. Another major assault occurred on 12 August, during which many thousands of non-combatants were massacred in their shelters. The following day, the city fell, and Cuauhtémoc was captured (and hanged in 1525). At least 100,000 people died, and the city was left in ruins, reduced to rubble, and completely destroyed. After the Fall of Tenochtitlan, Cortés directed the burning of Aztec books and records, destroyed monuments, removed idols from temples, and purged the sites of sacrificial remnants to prepare the locations for Catholic worship.