CHAPTER XIV.
1847.
In order to understand the ensuing military movements, it will be proper for the reader to study the map of the valley, and acquaint himself fully with the relative posture of both parties. The plans of both generals in chief were well made; but the blunders and obstinacy of the Mexican second in command disconcerted Santa Anna's desired combination, and ultimately opened the ground to the American advance with more ease than was anticipated.
We will sketch rapidly the military value of the arena upon which the combatants stood on the 18th of August, 1847.
Let us imagine ourselves beside General Scott, standing on one of the elevations above the town of San Agustin de las Cuevas, at the base of the southern mountain barrier of the valley, and looking northward towards the capital. Directly in front, leading to the city, is the main road, the left or western side of which, even from the gate of San Agustin to the Hacienda of San Antonio, and thence westwardly to San Angel, forms, together with the bases of the southern and western mountains about St. Geronimo and Contreras, a vast basin, ten or twelve square miles in extent, covered with the Pedregal or the field of broken lava which we have already mentioned. This mass of jagged volcanic matter, we must remember, was at that time barely passable with difficulty for infantry, and altogether impassable for cavalry or artillery, save by a single mule path. North, beyond the fortified hacienda and head-quarters of Santa Anna at San Antonio, the country opened. A line of field works, the lake of Xochimilco, a few cultivated farms, and vast flooded meadows, were on its right to the east, but from the hacienda, a road branches off to the west, leading around the northern edge of the Pedregal or lava field through Coyoacan and San Angel, whence it deflects southwardly to Contreras. The main road, however, continues onward, northwardly, from the hacienda of San Antonio, until it crosses the Churubusco river at the strong
