The separation of the two divisions was very impolitic at this juncture; for if the Mexicans had been aware of the smallness of our numbers, and had attacked either of the divisions during the five following days, before the brigantines had arrived, we should with difficulty have escaped destruction. Both divisions, therefore, remained as quiet as the enemy would allow them, though not a day passed by that the Mexicans did not land troops to annoy us in our camp, and, if possible, to entice us into places where we should be unable to act, and they could attack us to greater advantage.
Sandoval, as we have seen, left Tezcuco with his division four days after the feast of Corpus Christi, and marched towards Iztapalapan. His route lay through townships which were either subject to, or in alliance with Tezcuco. As soon as he arrived at Iztapalapan, he commenced his military operations by burning down the greater portion of the houses which stood on the mainland.
It was not long before large bodies of Mexican troops arrived for the protection of Iztapalapan, with whom Sandoval had a severe skirmish, and drove them back again to their canoes; but still they continued to shower their arrows and darts upon him, and wounded several of his men.
During this conflict a thick smoke was seen to rise from several signal fires which had been lighted on the surrounding hills. This had been a signal to call in all the canoes of Mexico and of the other towns situated on the lake, as Cortes had just run out from Tezcuco with the thirteen brigantines.
The first attack our general made with this fleet was against a rocky height on an island near Mexico. This place had been strongly fortified, and was garrisoned by a great number of Mexicans and inhabitants of other townships. All the canoes of Mexico, Xochimilco, Cojohuacan, Huitzilopuzco, Iztapalapan, and Mexicalzinco, had united in a body to oppose Cortes, which was the reason why the attack was carried on with so little vigour against Sandoval, who, however, was not able to do the enemy much damage, as most of the houses stood in the water; though, in the commencement of the attack, our allies had made many prisoners. In Iztapalapan, Saudoval found himself on a peninsula in the lake, and the only way by which he could reach Cojohuacan was by a causeway which ran half way through the lake, on which he would have been assailed from both sides by the enemy, without his being able to defend himself with much advantage.