The fight was between eight brigades on the Union side, with a detachment of cavalry and superior artillery attachments, against two of D. H. Hill’s and four of my brigades, with Rosser’s detachment of cavalry and artillery. Ripley’s brigade of Hill’s division marched for the fight, but lost its direction and failed to engage. The Confederate batteries made handsome combat, but were of inferior metal and munitions. Numerically, the Union brigades were stronger than the Confederates, mine having lost more than half its numbers by the wayside, from exhaustion under its forced march. It seems that several brigades failed to connect closely with the action. Ripley’s, on the Confederate side, General Hill said, “didn’t pull a trigger.” G. T. Anderson claimed that some of his skirmishers pulled a few triggers, while Harland’s Union brigade of Rodman’s division seems to have had little use for its guns. Lieutenant Crome brought a section of McMullen’s battery up in close connection with Cox’s advance, put it in, and held it in gallant action till his gunners were reduced to the minimum of working force, when he took the place of cannoneer and fought till mortally wounded.
On the Union side the officers had their time to organize and place their battle, and showed skill in their work. The Confederates had to meet the battle, as it was called, after its opening, on Rosser’s detachment. The lamented Garland, equal to any emergency, was quick enough to get his fine brigade in, and made excellent battle, till his men, discouraged by the loss of their chief, were overcome by the gallant assault under Cox. General Reno, on the Union side, an officer of high character and attainments, was killed about seven o’clock P.M. Among the Union wounded was Colonel Rutherford B. Hayes; afterwards President of the United States.
The pass by the lower trail, old Sharpsburg road, was opened by this fight, but the Confederates standing so close upon it made it necessary that they should be dislodged before it could be utilized.
The First Corps marched from the Monocacy at daylight and approached the mountain at one P.M. General Hooker had three divisions, under Generals Hatch, Ricketts, and Meade. General Hatch had four brigades, Generals Ricketts and Meade three each, with full artillery appointments. At two o’clock, General Hooker was ordered north of the turnpike to make a diversion in favor of the troops operating on the south side under General Reno. Meade’s division was marched, followed by Hatch’s and Ricketts’s,—Meade’s on the right, Hatch on Meade’s left, Ricketts in reserve. Meade’s division was deployed along the foot-hills. A cavalry regiment under Colonel Williams, First Massachusetts, was sent to the far right in observation. Meade’s advance was followed by Hatch and Ricketts.
General Hill’s only available force to meet this formidable move was his brigade under General Rodes. He ordered Rodes to his left to a prominent position about a mile off which commanded that part of the field. Cutts’s battalion of artillery had been posted on the left of the turnpike, to cover by its fire the route just assigned for Hooker’s march. The weight of the attack fell upon Rodes’s brigade, and was handsomely received. Evans’s brigade, fortunately, came up, and was sent to General Hill, who ordered it out to connect with Rodes’s right. Before making close connection it became engaged, and operated near Rodes’s right, connecting with his fight and dropping back as the troops on his left were gradually forced from point to point.
As the brigades under Generals Kemper, Garnett, and Colonel Walker (Jenkins’s brigade) approached the mountain, a report reached general head-quarters that the enemy was forcing his way down the mountain by the old Sharpsburg road. To meet this General Lee ordered those brigades to the right, and they marched a mile and more down a rugged way along the base of the mountain before the report was found to be erroneous, when the brigades were ordered back to make their way to the pike and to the top of the mountain in double time. General Rodes had five regiments, one of which he left to partially cover the wide opening between his position and the turnpike. In view of the great force approaching to attack him his fight seemed almost hopeless, but he handled his troops with skill, and delayed the enemy, with the little help that finally came, till night, breaking from time to time as he was forced nearer our centre at the turnpike.
Gibbon’s brigade had been called from Hooker’s corps, and was ordered up the mountain by the direct route as the corps engaged in its fight farther off on the right.
A spur of the mountain trends towards the east, opening a valley between it and the mountain. Through this valley and over the rising ground Meade’s division advanced and made successful attack as he encountered the Confederates. Cooper’s battery marched, and assisted in the several attacks as they were pushed up the mountain slope. The ground was very rough, and the Confederates worked hard to make it too rough, but the divisions, with their strong lines of skirmishers, made progress. Rodes made an effort to turn the right of the advancing divisions, but Hooker put out a brigade from Hatch’s division, which pushed off the feeble effort, and Rodes lost his first position.
It was near night when the brigades under Generals Kemper and Garnett and Colonel Walker returned from their march down the foot of the mountain and reached the top. They were put in as they arrived to try to cover the right of Rodes and Evans and fill the intervening space to the turnpike. As they marched, the men dropped along the road, as rapidly as if under severe skirmish. So manifest was it that nature was exhausted, that no one urged them to get up and try to keep their ranks. As the brigades were led to places along the line, the divisions of Hatch and Ricketts were advancing; the former, in range, caught the brigades under fire before their lines were formed. At the same time Meade’s division was forcing Rodes and Evans from their positions, back towards the turnpike.
General McClellan claimed fifteen hundred prisoners taken by his troops, and that our loss in killed and wounded was greater than his own, which was fifteen hundred. He estimated the forces as about equal, thirty thousand each. General D. H. Hill does not admit that the Confederates had more than nine thousand.