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General Scott abstained from entering the city at this time, because Mr. Nicholas P. Trist, the commissioner on the part of the United States to negotiate a treaty of peace with Mexico, was with the army, and either he or General Scott thought—probably both of them—that a treaty would be more possible while the Mexican government was in possession of the capital than if it was scattered and the capital in the hands of an invader. Be this as it may, we did not enter at that time. The army took up positions along the slopes of the mountains south of the city, as far west as Tacubaya. Negotiations were at once entered into with Santa Anna, who was then practically THE GOVERNMENT and the immediate commander of all the troops engaged in defence of the country. A truce was signed which denied to either party the right to strengthen its position, or to receive reinforcements during the continuance of the armistices, but authorized General Scott to draw supplies for his army from the city in the meantime.
Negotiations were commenced at once and were kept up vigorously between Mr. Trist and the commissioners appointed on the part of Mexico, until the 2d of September. At that time Mr. Trist handed in his ultimatum. Texas was to be given up absolutely by Mexico, and New Mexico and California ceded to the United States for a stipulated sum to be afterwards determined. I do not suppose Mr. Trist had any discretion whatever in regard to boundaries. The war was one of conquest, in the interest of an institution, and the probabilities are that private instructions were for the acquisition of territory out of which new States might be carved. At all events the Mexicans felt so outraged at the terms proposed that they commenced preparations for defence, without giving notice of the termination of the armistice. The terms of the truce had been violated before, when teams had been sent into the city to bring out supplies for the army. The first train entering the city was very severely threatened by a mob. This, however, was apologized for by the authorities and all responsibility for it denied; and thereafter, to avoid exciting the Mexican people and soldiery, our teams with their escorts were sent in at night, when the troops were in barracks and the citizens in bed. The circumstance was overlooked and negotiations continued. As soon as the news reached General Scott of the second violation of the armistice, about the 4th of September, he wrote a vigorous note to President Santa Anna, calling his attention to it, and, receiving an unsatisfactory reply, declared the armistice at an end.