An occasional shell was thrown by the enemy into this part of our line, but without effect. The skirmishing of the light troops was kept up with trifling loss on our part until dark, when I became convinced that no serious attack would be made before the morning, and returned, with the Mississippi regiment and squadron of 2d dragoons, to Saltillo. The troops bivouacked without fires, and laid upon their arms. A body of cavalry, some fifteen hundred strong, had been visible all day in rear of the town, having entered the valley through a narrow pass east of the city. This cavalry, commanded by General Minon, had evidently been thrown in our rear to break up and harass our retreat, and perhaps make some attempt against the town if practicable. The city was occupied by four excellent companies of Illinois volunteers, under Major Warren of the 1st regiment. A field-work, which commanded most of the approaches, was garrisoned by Captain Webster's company, 1st artillery, and armed with two 24-pound howitzers, while the train and head-quarter camp was guarded by two companies of Mississippi riflemen, under Captain Rogers, and a field-piece commanded by Captain Shover, 3d artillery. Having made these dispositions for the protection of the rear, I proceeded on the morning of the 23d to Buena Vista, ordering forward all the other available troops. The action had commenced before my arrival on the field.

"During the evening and night of the 22d the enemy had thrown a body of light troops on the mountain side, with the purpose of outflanking our left; and it was here that the action of the 23d commenced at an early hour. Our riflemen, under Colonel Marshall, who had been reinforced by three companies under Major Trail, 2d Illinois volunteers, maintained their ground handsomely against a greatly superior force, holding themselves under cover, and using their weapons with deadly effect. About eight o'clock a strong demonstration was made against the centre of our position, a heavy column moving along the road. This force was soon dispersed by a few rapid and well-directed shots from Captain Washington's battery. In the mean time the enemy was concentrating a large force of infantry and cavalry under cover of the ridges, with the obvious intention of forcing our left, which was posted on an extensive plateau. The 2d Indiana and 2d Illinois regiments formed this part of our line, the former covering three pieces of light artillery, under the orders of Captain O'Brien-Brigadier-General Lane

being in the immediate command. In order to bring his men within effective range, General Lane ordered the artillery and 2d Indiana regiment forward. The artillery advanced within musket range of a heavy body of Mexican infantry, and was served against it with great effect, but without being able to check its advance. The infantry ordered to its support had fallen back in disorder, being exposed, as well as the battery, not only to a severe fire of small arms from the front, but also to a murderous cross-fire of grape and canister from a Mexican battery on the left. Captain O'Brien found it impossible to retain his position without support, but was only able to withdraw two of his pieces, all the horses and cannoneers of the third piece being killed or disabled. The 2d Indiana regiment, which had fallen back as stated, could not be rallied, and took no farther part in the action, except a handful of men, who, under its gallant colonel, Bowles, joined the Mississippi regiment, and did good service, and those fugitives who, at a later period in the day, assisted in defending the train and depôt at Buena Vista. This portion of our line having given way, and the enemy appearing in overwhelming force against our left flank, the light troops which had rendered such good service on the mountain were compelled to withdraw, which they did, for the most part, in good order. Many, however, were not rallied until they reached the depôt at Buena Vista, to the defence of which they afterward contributed.

"Colonel Bissell's regiment (2d Illinois), which had been joined by a section of Captain Sherman's battery, had become completely outflanked, and was compelled to fall back, being entirely unsupported. The enemy was now pouring masses of infantry and cavalry along the base of the mountain on our left, and was gaining our rear in great force. At this moment I arrived upon the field. The Mississippi regiment had been directed to the left before reaching the position, and immediately came into action against the Mexican infantry which had turned our flank. The 2d Kentucky regiment and a section of artillery under Captain Bragg, had pre viously been ordered from the right to reinforce our left, and arrived at a most opportune moment. That regiment, and a portion of the 1st Illinois, under Colonel Hardin, gallantly drove the enemy, and recovered a portion of the ground we had lost. The batteries of Captains Sherman and Bragg were in position on the plateau, and did much execution, not only in front, but particularly upon the

masses which had gained our rear. Discovering that the enemy was heavily pressing upon the Mississippi regiment, the 3d Indiana regiment, under Colonel Lane, was despatched to strengthen that part of our line, which formed a crotchet perpendicular to the first line of battle. At the same time Lieutenant Kilburn, with a piece of Captain Bragg's battery, was directed to support the infantry there engaged. The action was for a long time warmly sustained at that point-the enemy making several efforts both with infantry and cavalry against our line, and being always repulsed with heavy loss. I had placed all the regular cavalry and Captain Pike's squadron of Arkansas horse under the orders of Brevet LieutenantColonel May, with directions to hold in cheek the enemy's column, still advancing to the rear along the base of the mountain, which was done in conjunction with the Kentucky and Arkansas cavalry under Colonels Marshall and Yell.

"In the mean time our left, which was still strongly threatened by a superior force, was farther strengthened by the detachment of Captain Bragg's, and a portion of Captain Sherman's batteries to that quarter. The concentration of artillery fire upon the masses of the enemy along the base of the mountain, and the determined resistance offered by the two regiments opposed to them, had created confusion in their ranks, and some of the corps attempted to effect a retreat upon their main line of battle. The squadron of the 1st dragoons, under Lieutenant Rucker, was now ordered up the deep ravine which these retreating corps were endeavouring to cross, in order to charge and disperse them. The squadron proceeded to the point indicated, but could not accomplish the object, being exposed to a heavy fire from a battery established to cover the retreat of those corps. While the squadron was detached on this service, a large body of the enemy was observed to concentrate on our extreme left, apparently with the view of making a descent upon the hacienda of Buena Vista, where our train and baggage were deposited. Lieutenant-Colonel May was ordered to the support of that point, with two pieces of Captain Sherman's battery under Lieutenant Reynolds. In the mean time, the scattered forces near he hacienda, composed in part of Majors Trail and Gorman's comnands, had been to some extent organized under the advice of Major Monroe, chief of artillery, with the assistance of Major Morrison, volunteer staff, and were posted to defend the position. Before