But in 1518 Velázquez put him in command of an expedition to explore and secure the interior of Mexico for colonization. At the last minute, due to the old gripe between Velázquez and Cortés, he changed his mind and revoked his charter. Cortés ignored the orders and went ahead anyway, in February 1519, in an act of open mutiny. He landed along with 600 men in the Yucatan Peninsula, in
Maya territory . There, he met
Jeronimo de Aguilar, a Spaniard who had survived from a shipwreck and joined the troops . Jeronimo de Aguilar, a Franciscan priest, had learnt Maya during his captivity, and could thus translate for Cortés. In March 1519, Cortés formally claimed the land for the Spanish crown. He then won a battle against the Natives of
Tabasco, during which he received from the vainquished twenty young indigenous women, among whom
La Malinche, his future mistress, who knew both the
Nahuatl language and Maya, thus enabling Hernán Cortés to communicate in both.
In July 1519, his men took over
Veracruz: by this act, Cortés dismissed the authority of the governor of Cuba to place himself directly under the orders of Charles V . Leaving a hundred men in Veracruz, Cortès marched on
Tenochtitlan in mid-August 1519, along with 400 men, 15 horsemen, 15
cannons, and hundred of indigenous carriers and warriors . On the way to
Tenochtitlan, Cortés made alliances with
native American polities such as the
Nahuas of
Tlaxcala, the
Tlaxcaltec, defeated in a battle and then allies, and the
Totonacs of
Cempoala. In October 1519, Cortés and his men, accompanied by about 3,000 Tlaxcalteca, marched to
Cholula, the second largest city in central Mexico. Cortés, either in a pre-meditated effort to instill fear upon the Aztecs waiting for him at Tenochtitlan or (as he later claimed when under investigation) wishing to make an example when he feared native treachery, conducted an infamous massacre here, killing thousands of unarmed members of the nobility gathered at the central plaza and partially burning down the city.
By the time he arrived in Tenochtitlan the Spaniards had a large army. On 9 November 1519, they were peacefully received by the Aztec Emperor
Moctezuma II. The latter deliberately let Cortés enter the heart of the Aztec Empire, hoping to get to know their weaknesses better and to crush them later . He gave lavish gifts in gold to the Spaniards which enticed them to plunder vast amounts of gold. In his letters to Charles V, Cortés claims to have learned at this point that he was considered by the Aztecs to be either an emissary of the feathered serpent god
Quetzalcoatl or Quetzalcoatl himself — a belief which has been contested by some modern historians . But quickly Cortès learnt that Spaniards on the coast had been attacked, and decided to take Moctezuma into hostage in his own house, requesting him to swear allegiance to Charles V.
Meanwhile, the Governor of Cuba sent another expedition, lead by
Pánfilo de Narváez, to oppose Cortès, arriving in Mexico in April 1520 with 1,100 men . Cortès henceforth decided to leave Tenochtitlan to fight Narváez, whom he overcame despite his numerical inferiority . But in Mexico, one of Cortès' lieutenant committed
a massacre in the Main Temple, triggering a local rebellion. Cortès speedily returned to Mexico and proposed an armistice, attempting to support himself on Moctezuma. But the latter was killed by his subjects on July 1, 1520, and Cortès decided to flee for Tlaxcala. During the
Noche Triste (30 June-1st July 1520), the Spaniards managed to escape from Mexico, while their backguard was being massacred. Lot of the treasure looted by Cortés was lost (as well as his artillery) during this panicked escape from Tenochtitlan . After a battle in
Otumba, they managed to reach Tlaxcala, after having lost 870 men . With the assistance of their allies, Cortès' men finally prevailed with reinforcements arriving from
Cuba. Cortés began a policy of
attrition towards the island city of
Tenochtitlan cutting off supplies and subduing the Aztecs' allied cities thus changing the balance, and organizing the
siege of Tenochtitlan, destroying the city.
In January 1521, Cortès countered a conspiracy against him, head by Villafana, who was hanged . Finally, with the capture of
Cuauhtémoc, the
Tlatoani (ruler) of Tenochtitlan, on 13 August 1521, the Aztec Empire disappeared. From 1521 to 1524, Cortés personally governed Mexico .