What is the title of the text from which the following excerpt is taken? A. When they arrived, the Tlaxcaltecas and the men of Cholula called to each other and shouted greetings. An assembly was held in the courtyard of the god, but when they had all gathered together, the entrances were closed, so that there was no way of escaping. Then the sudden slaughter began: knife strokes, and sword strokes, and death. The people of Cholula had not foreseen it, had not suspected it. They faced the Spaniards without weapons, without their swords or their shields. The cause of the slaughter was treachery. They died blindly, without knowing why, because of the lies of the Tlaxcaltecas.