night the guns were removed to a position nearly in front of the mill, — — -thus making El Molino del Hey the strong point of the position, and the centre the weak one. About four hundred yards west of Casa de Mata, there was a deep ravine, impassable except near the enemy's line, extending some distance to the south, and flanking the broad plain in front. On the south side of the plain the ground rose into a ridge, falling away gradually as it approached Tacubaya, something more than a mile from El Molino, — which consisted of a long range of buildings facing the plain. Thirty 0r forty yards in advance of Casa de Mata and El Molino del Rey, both of which were slightly elevated above the plain, there was a dry ditch, with a breast-height for the protection of infantry, reaching, in a semicircle, from the mill to the ravine. Casa de Mata being upon a retired line, a column approaching over the plain would necessarily be subject to a severe converging, or flank fire, in addition to that in front; except that, as the road to Tacubaya formed the prolongation of the enemy's left, an attacking force moving forward upon that route would be less exposed, and possess the advantage of having an enfilading fire on that flank.
Quietly and orderly the American troops fell into their places, before daylight on the 8th of September; and when objects could be first discovered, in the gray of the morning, they Were seen drawn up in readiness for action, within six hundred yards of the Mexican line. Captain Drum, with the two six-pounders lost at Buena Vista, but recovered at Contreras, was posted on the road leading north from Tacubaya, past the western front of El Molino del Rey. Colonel Garland was ordered to support the battery, and in time assault
