How the captain Sandoval marches to Chalco and Tlalmanalco, and what he did there.
Sandoval set out with his troops on the 12th of March, 1521. The first night he encamped at Chalco, and arrived the next morning early before Tlalmanalco, where the caziques and inhabitants gave him a most hearty welcome, and provided abundance of food for his troops; but the caziques informed him he had still to march further on to the large township of Huaxtepec, where a large body of Mexican troops was stationed, who would be joined by all the warriors of the province.
Sandoval, on receiving this information, concluded that there was no time to be lost, and immediately marched towards Chimalhuacan, which was subject to Chalco, where he quartered his troops for the night. The inhabitants of Chalco had sent out spies in every direction, and learnt that the enemy was not far off, but lay in wait for the Spaniards in the thickets and hollows of the mountains. Sandoval, who was an officer of great determination and foresight, ordered his march as follows: the musketeers and crossbow-men went in advance, the cavalry were to follow three and three together, and when the former had discharged their pieces, the horse were to charge the enemy's line at full gallop, and to direct the point of their lances at the face, and continue the attack until the enemy was put to flight. The infantry were to keep their ranks firmly closed, and not to rush in upon the enemy until a signal for that purpose was given. This order of attack Sandoval deemed necessary, as the enemy's numbers were very great, and the nature of the ground unfavorable for his manœuvres; besides that, it was impossible to discover whether the Mexicans had not dug pits or laid other snares to entrap the Spaniards; so that it was quite necessary his small army should keep close together in a body.