I was with the earliest of the troops to enter the Mills. In passing through to the north side, looking towards Chapultepec, I happened to notice that there were armed Mexicans still on top of the building, only a few feet from many of our men. Not seeing any stairway or ladder reaching to the top of the building, I took a few soldiers, and had a cart that happened to be standing near brought up, and, placing the shafts against the wall and chocking the wheels so that the cart could not back, used the shafts as a sort of ladder extending to within three or four feet of the top. By this I climbed to the roof of the building, followed by a few men, but found a private soldier had preceded me by some other way. There were still quite a number of Mexicans on the roof, among them a major and five or six officers of lower grades, who had not succeeded in getting away before our troops occupied the building. They still had their arms, while the soldier before mentioned was walking as sentry, guarding the prisoners he had SURROUNDED, all by himself. I halted the sentinel, received the swords from the commissioned officers, and proceeded, with the assistance of the soldiers now with me, to disable the muskets by striking them against the edge of the wall, and throw them to the ground below.

Molino del Rey was now captured, and the troops engaged, with the exception of an appropriate guard over the captured position and property, were marched back to their quarters in Tacubaya. The engagement did not last many minutes, but the killed and wounded were numerous for the number of troops engaged.

During the night of the 11th batteries were established which could play upon the fortifications of Chapultepec. The bombardment commenced early on the morning of the 12th, but there was no further engagement during this day than that of the artillery. General Scott assigned the capture of Chapultepec to General Pillow, but did not leave the details to his judgment. Two assaulting columns, two hundred and fifty men each, composed of volunteers for the occasion, were formed. They were commanded by Captains McKinzie and Casey respectively. The assault was successful, but bloody.

In later years, if not at the time, the battles of Molino del Rey and Chapultepec have seemed to me to have been wholly unnecessary. When the assaults upon the garitas of San Cosme and Belen were determined upon, the road running east to the former gate could have been reached easily, without an engagement, by moving along south of the Mills until west of them sufficiently far to be out of range, thence north to the road above mentioned; or, if desirable to keep the two attacking columns nearer together, the troops could have been turned east so as to come on the aqueduct road out of range of the guns from Chapultepec. In like manner, the troops designated to act against Belen could have kept east of Chapultepec, out of range, and come on to the aqueduct, also out of range of Chapultepec. Molino del Rey and Chapultepec would both have been necessarily evacuated if this course had been pursued, for they would have been turned.

General Quitman, a volunteer from the State of Mississippi, who stood well with the army both as a soldier and as a man, commanded the column acting against Belen. General Worth commanded the column against San Cosme. When Chapultepec fell the advance commenced along the two aqueduct roads. I was on the road to San Cosme, and witnessed most that took place on that route. When opposition was encountered our troops sheltered themselves by keeping under the arches supporting the aqueduct, advancing an arch at a time. We encountered no serious obstruction until within gun-shot of the point where the road we were on intersects that running east to the city, the point where the aqueduct turns at a right angle. I have described the defences of this position before. There were but three commissioned officers besides myself, that I can now call to mind, with the advance when the above position was reached. One of these officers was a Lieutenant Semmes, of the Marine Corps. I think Captain Gore, and Lieutenant Judah, of the 4th infantry, were the others. Our progress was stopped for the time by the single piece of artillery at the angle of the roads and the infantry occupying the house-tops back from it.

West of the road from where we were, stood a house occupying the south-west angle made by the San Cosme road and the road we were moving upon. A stone wall ran from the house along each of these roads for a considerable distance and thence back until it joined, enclosing quite a yard about the house. I watched my opportunity and skipped across the road and behind the south wall. Proceeding cautiously to the west corner of the enclosure, I peeped around and seeing nobody, continued, still cautiously, until the road running east and west was reached. I then returned to the troops, and called for volunteers. All that were close to me, or that heard me, about a dozen, offered their services. Commanding them to carry their arms at a trail, I watched our opportunity and got them across the road and under cover of the wall beyond, before the enemy had a shot at us. Our men under cover of the arches kept a close watch on the intrenchments that crossed our path and the house-tops beyond, and whenever a head showed itself above the parapets they would fire at it. Our crossing was thus made practicable without loss.

When we reached a safe position I instructed my little command again to carry their arms at a trail, not to fire at the enemy until they were ordered, and to move very cautiously following me until the San Cosme road was reached; we would then be on the flank of the men serving the gun on the road, and with no obstruction between us and them. When we reached the south-west corner of the enclosure before described, I saw some United States troops pushing north through a shallow ditch near by, who had come up since my reconnaissance. This was the company of Captain Horace Brooks, of the artillery, acting as infantry. I explained to Brooks briefly what I had discovered and what I was about to do. He said, as I knew the ground and he did not, I might go on and he would follow. As soon as we got on the road leading to the city the troops serving the gun on the parapet retreated, and those on the house-tops near by followed; our men went after them in such close pursuit—the troops we had left under the arches joining—that a second line across the road, about half-way between the first and the garita, was carried. No reinforcements had yet come up except Brooks's company, and the position we had taken was too advanced to be held by so small a force. It was given up, but retaken later in the day, with some loss.

Worth's command gradually advanced to the front now open to it. Later in the day in reconnoitring I found a church off to the south of the road, which looked to me as if the belfry would command the ground back of the garita San Cosme. I got an officer of the voltigeurs, with a mountain howitzer and men to work it, to go with me. The road being in possession of the enemy, we had to take the field to the south to reach the church. This took us over several ditches breast deep in water and grown up with water plants. These ditches, however, were not over eight or ten feet in width. The howitzer was taken to pieces and carried by the men to its destination. When I knocked for admission a priest came to the door who, while extremely polite, declined to admit us. With the little Spanish then at my command, I explained to him that he might save property by opening the door, and he certainly would save himself from becoming a prisoner, for a time at least; and besides, I intended to go in whether he consented or not. He began to see his duty in the same light that I did, and opened the door, though he did not look as if it gave him special pleasure to do so. The gun was carried to the belfry and put together. We were not more than two or three hundred yards from San Cosme. The shots from our little gun dropped in upon the enemy and created great confusion. Why they did not send out a small party and capture us, I do not know. We had no infantry or other defences besides our one gun.

The effect of this gun upon the troops about the gate of the city was so marked that General Worth saw it from his position.

[Mentioned in the reports of Major Lee, Colonel Garland and General Worth.—PUBLISHERS.]