crowned hill. The Mexican array was found to consist of an extended line of cavalry and infantry, sustained by a field battery of four guns, either occupying directly or supporting a system of defences collateral to the castle and summit; but as the lines were skilfully masked a very inadequate idea of the extent of the forces was obtained. Captain Mason's reconnoissance on the morning of the same day, represented the enemy's left as resting on and occupying the group of strong stone buildings at the Molino adjacent to the grove at the foot of Chapultepec and directly under the castle's guns. The right of his line rested on the Casa Mata, at the foot of the ridge sloping gradually to the plain below from the heights above Tacubaya; while, midway between these buildings, were the field battery and infantry forces disposed on either side to support it. This reconnoissance indicated that the centre was the weak point of the position, and that its left flank was the strongest. In the Mill or Molino, on the left, was the brigade of General Leon, reinforced by the brigade of General Rangel; in the Casa Mata, on the right, was the brigade of General Perez; and on the intermediate ground was the brigade of General Ramirez, with several pieces of artillery. The Mexican reserve was composed of the 1st and 3d light, stationed in the groves of Chapultepec, while the cavalry consisting of 4,000 men, rested at the hacienda of Morales, not very far from the field. Such was the arrangement of the Mexican forces made by Santa Anna in person on the 7th of September, though it has been alleged by Mexican writers that it was somewhat changed during the following night. The wily chief had not allowed the time to pass during the negotiation between Trist and the Commissioners in political discussion alone. Regarding the failure of the treaty as most probable, he had striven to strengthen once more the military arm of his nation, and the first result of this effort was demonstrated in his disposition of troops at El Molino del Rey. The Americans' attack upon Chapultepec, as commanding the nearest and most important access to the city had been foreseen by him as soon as the armistice ended, and as a military man, he well knew that the isolated hill and castle could not be protected by the defenders within its walls alone or by troops stationed either immediately at its base or on the sloping road along its sides.
General Scott's plan of assault upon the city seems now to have been matured, though it required several days for full development according to the reconnoissances of his engineers. He designed to make the main assault, on the west and not on the south of the city.
