Upon their leaving, Cortez had an interview with Montezuma's ambassadors, who had accompanied him from the coast, and told them that he was aware of the treacherous plot to destroy him and his army, and that he was grieved to find that this vile act of treachery was instigated by Montezuma. The ambassadors, astounded at what appeared to them the supernatural knowledge of Cortez, and terrified at the position in which they found themselves, made earnest protestations of their entire ignorance of the scheme; and declared that they were convinced that the emperor was wholly innocent of it, and that it was entirely the act of the Cholulans. Cortez pretended to believe them, as he was desirous, as long as possible, of keeping up a semblance of friendship with Montezuma; and declared that he was willing to believe that, after the friendly messages and gifts the emperor had sent, he could not be guilty of such baseness and treachery. His anger therefore would be directed chiefly against the Cholulans, who were guilty not only of foul treachery to himself, but of dishonoring the emperor's name by their conduct.
As soon, however, as the ambassadors had retired, a strong guard was placed over them, to prevent them from communicating with the citizens. Every precaution was taken, in case the plans of the enemy should be altered, and an attack made during the night. The guns were placed so as to command the approaches. The horses were kept saddled, and ready for action. Strong guards were placed, and the troops lay down in their armor. Orders were dispatched, to the Tlascalans, to hold themselves ready to march into the city in the morning, and join the Spaniards.
As soon as daylight broke, the troops were under arms. A portion of those, with the guns, were posted outside the building, so as to sweep the streets. A strong body were told off to guard the three gates of entrance. The rest were drawn up in the great court, which was surrounded partly by buildings, partly by high walls.
Soon after the arrangements were completed the caziques arrived, having with them a body of men even larger than they had agreed to bring. As soon as they entered, Cortez called them to him, and informed him that he was acquainted with all the particulars of the conspiracy. He had come to that city upon the invitation of the emperor, had given them no cause of complaint, and had left his allies outside the walls. Under the guise of kindness and hospitality, they had prepared a snare to cut off and destroy them.
The Cholulans were astounded. It seemed to them useless to deny anything to men who could thus read their thoughts, and they confessed that the accusation was true.
Cortez raised his hand. A gun gave the signal, a terrible volley was poured into the Cholulans, and the Spaniards then fell upon them with pikes and swords. The unfortunate natives, thus taken by surprise, and penned up like sheep in the enclosure, scarcely offered any resistance; some tried to escape through the gateways, but were repulsed by the troops stationed there. Others strove, but in vain, to scale the walls, and the only survivors of the massacre owed their lives to hiding under the great piles of dead.
In the meantime, the Mexicans without, being made aware by the heavy firing of the failure of their plan of surprise, rushed from the buildings in which they had been stationed, and poured up to the assault. They were swept down by the discharges of the guns, but the places of the slain were rapidly filled, and with reckless bravery they pressed up to the Spaniards; although Cortez, at the head of his cavalry, charged them again and again, so as to give the gunners time to reload.
The struggle was still proceeding when the Tlascalans entered the gates of the city and, coming up at a run to the scene of conflict, fell upon the rear of the Mexicans. These could no longer resist their terrible opponents and, breaking their ranks, took refuge in the houses, or fled to the temples.
One large body, headed by the priests, made a stand upon the great central teocalli. There was a tradition among them that, if its stones were removed, the god would pour out an inundation of water to overwhelm his enemies. The Cholulans tore down some of the stones, and when the expected miracle did not take place, were seized with despair. Many shut themselves up in the wooden towers on the platform of the summit, and poured down missiles on their foes as they climbed the great staircase; but the darts and arrows fell harmless upon the armor of the Spaniards, and when these gained the platform, they snatched up the blazing arrows shot at them, and fired the turrets. The Cholulans fought to the last, and either threw themselves over the parapet, or perished in the flames.
In the meantime, many of the wooden houses in the town had caught fire, and the flames spread rapidly. The Spanish cavalry charging through the street trampled the Mexicans under foot, while the Tlascalan allies gratified their long enmity against the Cholulans by slaying them without mercy.