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.