The foreigners used their cannon to knock down the walls that the Mexica had built as obstructions and even demolished whole buildings. Then they sent in their indigenous allies to fill in the canals with rubble or sand, while the long-range crossbows and guns guarded them. Once the Spaniards had access to a flat, open space, they could easily maintain control of it with their horses and lances. Every day, the Spaniards killed dozens of the Mexica at a minimum; once they killed several hundred in a single day. One of the warriors, when he was an old man, remembered: “Bit by bit they came
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