Cortes considered this expedition against the Xaltocans of no small importance, and was therefore determined to command in person. The troops he took with him consisted of two hundred and fifty Spanish foot, thirty horse, with a good number of musketeers and crossbow-men; accompanied by the whole of our Tlascallan friends, and a company of the best warriors of Tezcuco. Of our own officers Cortes selected Alvarado and Oli; Sandoval remaining behind for the protection of Tezcuco, and of our brigantines. We were indeed obliged to be particularly on our guard, for Mexico lay close at hand, nor could we altogether place confidence in the Tezcucans, as the Mexicans had so many friends and relations among them. Before his departure Cortes left especial orders with Sandoval and Lopez to expedite the building of the brigantines, and only allowed them fifteen days more to finish and launch them. He then, after having attended mass, set out on his march. In the neighbourhood of Xaltocan he came up with a large body of Mexicans, who had taken up a strong position, from which they imagined to make a successful attack upon the Spaniards and their horses. Cortes here placed himself at the head of the cavalry, and, after our musketeers and crossbow-men had fired in among the enemy, he charged their line full gallop, and killed several of them. The Mexicans then retreated to the mountains, where they were pursued by the Tlascallans, who slew above thirty more of their numbers. The first night Cortes encamped in a small hamlet, ordered frequent patrols, posted sentinels in all quarters, and observed every military precaution, as there were many considerable townships in this district. Here we learnt that Quauhtemoctzin had despatched large bodies of troops to the assistance of Xaltocan, which were stationed in canoes on the lake. Very early next morning we were attacked by the joint forces of the Mexicans and Xaltocans. They kept pouring forth showers of arrows and stones upon us from the small islands which rose among the marshes, by which ten Spaniards and numbers of Tlascallans were wounded. Here our cavalry was completely useless, as they could not pass through the water, which lay between them and the enemy; for they had previously cut through the causeway which led to Xaltocan, and thereby inundated the country. Our musketeers and crossbow-men certainly kept up a brisk fire upon the Mexicans, but here again they had found means to shield their bodies, by raising up boards alongside of their canoes.