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The native allies arrived in time, and Cortés then organized his troops for battle. I divided them and assigned them to three captains, each of whom with his division was to be stationed in one of three cities around Tenochtitlán. I made Pedro de Alvarado captain of one division and assigned him thirty horsemen, eighteen crossbow-men and gunners, and one hundred and fifty foot soldiers, and more than twenty-five thousand warriors of our allies. They were to make their headquarters at Tacuba. I made Cristóbal de Olid captain of another division . . . the division to make their headquarters in Coyoacán. Gonzalo de Sandoval was captain of the third division . . . This division was to go to Ixtapalapa and destroy it, then to advance over a causeway, protected by the ships, to join the garrison at Coyoacán. After I entered the lake with the ships, Sandoval would fix his headquarters where it suited him best. For the thirteen ships I left three hundred men, almost all of them sailors and well drilled, so that each ship had twenty-five Spaniards, and each of the small vessels had a captain, a pilot, and six crossbowmen and gunners. On May 10, Alvarado and Olid left Texcoco with their commands. The siege of Tenochtitlán was about to begin. It was to become the longest siege and one of the bloodiest battles in the history of the New World. At its end, an entire civilization would be destroyed and the largest city ever found by the conquistadors laid waste.
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Irwin R. Blacker (Cortés and the Aztec Conquest)