Around the end of March 1519,
Hernán Cortés landed with a Spanish
conquistador force at
Potonchán on the coast of modern-day
Mexico. Cortés had been commissioned by Governor
Diego Velázquez de Cuéllar of Spanish-controlled
Cuba to lead an expedition in the area, which was dominated by the
Mexica. At the last moment, though, Velázquez revoked Cortés's commission, but he decided to launch his expedition regardless. Through a combination of raw force and political maneuvering, Cortés was able to secure the allegiance of the
Totonacs and the
Tlaxcaltec among other groups during his advance on the Empire's main settlement,
Tenochtitlan. In November, a Spanish force entered the city and was greeted by its ruler,
Moctezuma II. Initially, the conquistadors were treated well by the Aztecs while they stayed in the city, until Velázquez, angered at Cortés' disobedience, sent an armed force at the command of Pánfilo Narváez against Cortés to bring him to justice and claim the lands and riches he had conquered. Cortés was forced to leave a small garrison of men in Tenochtitlan at the command of one of his lieutenants, Pedro de Alvarado, whilst he took his small force to meet Narváez in battle. After securing a quick and victory, Cortés joined Narvaez' forces to his own, and marched back to Tenochtitlán, as he had heard word that the city was up in arms against the remaining Spaniards. Upon arriving, Alvarado told Cortés' he had been convinced that the Mexica planned to attack the Spaniards and thus struck preemptively during an
Aztec ritual ceremony, which caused an outrage in Tenochtitlán. The Aztecs selected a new
Tlatoani after the death of Moctezuma. Before the death of Moctezuma and
La Noche Triste, Cortés attempted to negotiate a peace, and as a last resort, urged Moctezuma to speak with his people to achieve a truce, but the population was angered and protested against Moctezuma. This was the state of affairs by the end of June 1520. Desperate to escape the city, and further convinced by an omen one of the Spaniards claimed to have received, the Spaniards resolved to leave the city that night in an event called
La Noche Triste (The Night of Sorrows). During this attempt at salvation, however, Cortés' forces and entourage (consisting of civilian women and men of both Spanish and Mesoamerican extraction) were severely cut down. Of the Spanish force of approximately 1,300, only less than 500 men at arms escaped with their lives, along with a few hundred Tlaxcalans and civilians. Cortés then started a retreat to
Tlaxcala, during which his force was harassed by Aztec
skirmishers, and the Aztec leadership resolved to eliminate them as they withdrew. ==Battle==