Sandoval composed his rearguard of five horse, an equal number of crossbow-men, and the greater part of the Tlascallans, who had all their booty with them. As the Mexicans had everywhere sent out scouts and spies to watch our movements, our present march to Chalco was no secret to them. They had therefore collected a strong body of their troops, and fell upon our rearguard, which was chiefly composed of Tlascallans. It may easily be supposed that our five horse and few crossbow-men could not stand long against these overpowering numbers; two were very soon killed, and the rest wounded. Sandoval had indeed hastened to their assistance with the first alarm, had succeeded in driving back the Mexicans, and killing seven of their men; yet they managed to gain their canoes, and retreat to a place of safety, which was the more easy for them to do, as the whole of the population of this district was subject to the Mexicans. Sandoval was uncommonly vexed when he found the five horses and their riders covered with wounds, two crossbow-men killed, and the rest all wounded. He severely reproached them for not having defended themselves better, and for the little protection they had proved to our Tlascallan friends. He could easily see, he added, that they had but recently arrived from Spain, and knew very little about fighting. His first care now was to provide for the safety of the Tlascallans and their baggage, and to despatch the letters Cortes had given him to Vera Cruz. In these letters our general had given the commandant of that town an account of all our conquests, and of his determination to besiege Mexico, and blockade it on all sides; the letter closed by desiring him to observe the utmost vigilance, and with orders to send all those of his men who were sufficiently strong for service to Tlascalla, where they were to remain until the road should be cleared of the enemy.