Archbishop’s Palace, 3½ miles from the main Plaza
of the City of Mexico, Sunday, August 22, 1847.

My dearest Wife,—The great battle of Mexico has been fought, and our arms have achieved a glorious triumph. Commissions are now sitting to treat of an armistice that will terminate, as we all trust, in a permanent and honorable peace to both countries. Mexico is again without an army, and the gates of the capital are open to us. Terrible was the conflict, severe our loss, particularly in efficient and gallant officers; the whole army was engaged, and the whole public force of Mexico struck down, large numbers of prisoners and a great amount of material of war falling into our hands.

My heart is filled with gratitude to the Most High that I had the strength to do my duty with the other officers of my corps, and that, although much exposed in three different reconnoissances and two hard-fought battles, I have escaped without a wound, and without any abatement of my health and strength. I cannot feel exultation. We have lost many brave officers and men, some my personal friends; streams of blood have in reality flowed over the battlefield. The hearts of the whole Mexican nation are thrilling with anguish and dismay. Such is war, so glittering and imposing on parade and in anticipation, so terrible in reality.

Puebla is about seventy-five miles from Mexico. On referring to the map, you will find that the direct road passes between lakes Tezcuco on the north, Chalco and Xochimilco on the south. At the Venta de Chalco, about twenty miles from Mexico, the road turns off to pass southward of the lakes. El Peñon, about eight miles from Mexico, is a high hill entirely surrounded with water, along the edge of which the great direct road to Mexico passes, consisting of a causeway for about a mile and a half approaching it, and also of a causeway the whole distance after leaving it, till we reach the City of Mexico.

General Twiggs with his splendid division was in the advance, followed on successive days by Quitman, Worth, and Pillow. In five days Twiggs was pushed up to Ayotla, fifteen or sixteen miles from Mexico, General Scott continuing with him in the advance, and the other divisions five, fifteen, and twenty-five miles in rear. As they came up (it required two days), they were held in reserve at the head of Lake Chalco, whilst the proper reconnoissances and examinations were made to determine the general plan of attack. The first day, a reconnoissance was made of the Peñon, supported by a squadron of dragoons, a regiment of infantry, and two pieces of artillery. The Peñon was found to be fortified and occupied in force. Captain Mason, of the engineers (my friend Mason), Major Gaines, of the Kentucky volunteers (taken prisoner just before the great battle of Buena Vista, and who made his escape only one or two days before the march of the army from Puebla), and myself rode some distance in the advance, and observed near the causeway some eight or ten Mexican officers. We were at least three quarters of a mile from the rest of our force. We advanced upon them, they curveting their horses and advancing upon us. When within about three hundred yards they discharged their pistols, but we continuing our advance, they all turned their horses and returned full speed across the causeway, carrying with them a troop of lancers. The whole affair was very amusing and afforded much sport. It did not diminish our contempt of Mexican prowess.

The second day a splendid reconnoissance was made of the whole country between the lakes, including the Peñon and Mexicalcingo at the head of Lake Xochimilco. The particular reconnoissance of the Peñon was intrusted to me. On my little horse, one of the most enduring, spirited, and beautiful animals in the service, with two dragoons, I went half way round the Peñon, and was for seven hours within almost point-blank range of its guns, examining the different batteries, determining the various approaches, and particularly the character of the inundation. Frequently I was in the water up to the belly of my horse. General Scott was very much pleased with my reconnoissance, and I got more credit for it than I deserved. The same day Mason made an admirable reconnoissance of Mexicalcingo.

Our spies had given information that the road around Chalco was impracticable for our trains, and in consequence thereof the general almost made up his mind to force Mexicalcingo, and at that point and westward, fight the great battle of the war. He, however, determined to wait one day for additional information.

Worth, who had now come up, was sent to Chalco, and a column under the orders of Colonel Duncan reconnoitred the road around the lakes. Our spies were found to have given wrong information, and the road, though bad, was found to be practicable. That same evening General Scott, with the whole field before him, determined to move around Chalco, and ordered the movement to commence on the morrow.

The prompt advance of Twiggs to Ayotla, the brigade of dragoons of the famous Colonel Harney two miles farther in advance, and the brilliant reconnoissances of the two succeeding days impressed the enemy with the belief that the Peñon was to be attacked, and they lost no time in filling the place with troops, and putting in position formidable batteries of nearly forty guns.

In the movement around the lakes Worth was in the advance, followed by Pillow, Quitman, and Twiggs. The road was exceedingly bad and narrow, in many places a perfect defile, obstructed by cuts, stones from the hills in some cases formed into walls, and requiring great patience, energy, and perseverance for the passage of the trains.