mountains. These obstacles necessarily consumed time, but the simple-minded Indians of the neighborhood, who had just been compelled by the Mexicans to throw the impediments in the Americans' way, were perhaps more easily induced to aid in clearing the path for the invaders, than their ancestors had been in the days of Cortéz. On the afternoon of the 17th, Worth, with the advance, reached San Agustin, at the foot of the mountains, and at the intersection of the southern road from Mexico to Cuernavaca and Acapulco—a point whose topography we have already described;—and, on the 18th, the rear division entered the town.
As soon as Santa Anna discovered Scott's advance by the Chalco route, and that the attack on Mexico would be made from the south instead of the east, he at once perceived that it was useless to attack the American rear, whilst passing the defiles between the lake and the mountains even if he could possibly come up with it, and consequently, that it was best for him to quit his head quarters at El Peñon, while he also recalled General Valencia with the most of the troops at Tezcoco and at Mexicalzingo, which were no longer menaced by the foe. Santa Anna himself, established his quarters at the fortified hacienda of San Antonio, and ordered Valencia to march his whole division, cavalry, infantry and artillery, to the town of San Angel and Coyoacan, so as to cover the whole west and centre of the valley in front of Mexico.
