Yet for 7180 available Americans including those required to make a feint against the southern front—an "army" that had to contemplate still harder work beyond, and could not afford severe losses here—Chapultepec meant a great deal. In general the position formed an approximate rectangle about three fourths of a mile in length by one fourth of a mile in width, bounded at its western end by El Molino and on the other sides with high stone walls. In the south wall, at about its middle point, there was an opening covered on the outside by a sand-bag redan (B), unarmed. From the main gateway in the eastern end the causeway of Belén struck off toward the city, another road—guarded here by a cut and by two batteries—ran toward Tacubaya, and a third, after running westwardly into the rectangle and a little way up the slope until it arrived at a 4-pounder in a circular redoubt (C), flanked with an infantry entrenchment (D), turned sharply toward the northeast, and finally climbed to the summit.[1]
Here on a rectangular level space or terre-plein, supported at the eastern end by an almost vertical precipice and on the other sides by high, parapeted walls, rose the masonry buildings of the military college, 
Blindage at
Chapultepec skilfully though incompletely reinforced with sand-bags and screens of timber (blindage), supplemented with parapeted azoteas, and surrounded with ten effective guns, heavy and light. A deep, broad fosse at the base of the western wall, mines below that, and finally, half-way down the slope, a redan (E) strengthened this end, where the incline was gentlest. In swamps at the western foot of the hill stood a large grove of huge cypresses—extending also toward the main gateway—through which ran an east and west road commanded by this redan (E) and also by the wall of the fort. Beyond the grove came a north-and-south ditch, intended for drainage, with a redan-breastwork (A)—looking westward—at its northern end; and finally, after traversing level and open fields for about a quarter of a mile toward the west, one arrived at El Molino. Placed so conspicuously in view, 150 or 200 feet in height, Chapultepec seemed to deserve its popular reputation of impregnability, and the American soldiers
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