The first impact came from Hooker’s right division under Doubleday, led by the choice brigade under Gibbon. It was deployed across the turnpike and struck the centre of Jackson’s division, when close engagement was strengthened by the brigades of Patrick, Phelps, and part of Hofmann’s, Ricketts’s division, engaged in close connection along Lawton’s front. Hooker supported his battle by his division under Meade, which called into action three of D. H. Hill’s brigades,—Ripley’s, Colquitt’s, and McRae’s. Hartsuff, the leading spirit of Ricketts’s division, was the first general officer to fall severely hurt, and later fell the commander of the corps, wounded also. General Starke, commanding Jackson’s division, was killed. At six o’clock the Twelfth Corps came in, when General Lawton called for Hood’s brigades, “and all the help he could bring.” Hood’s and G. T. Anderson’s brigades were put in, and the brigades from my right, under J. G. Walker, marched promptly in response to this call.
The weight of Mansfield’s fight forced Jackson back into the middle wood at the Dunker chapel, and D. H. Hill’s brigades to closer lines. Hood was in season to brace them, and hold the line as he found it. In this fight the corps commander, General Mansfield, fell, mortally wounded, which took from that corps some of its aggressive power.
Jackson, worn down and exhausted of ammunition, withdrew his divisions at seven A.M., except Early’s brigade, that was with the cavalry. This he called back to vacant ground on Hood’s left. Two detachments, one under Colonel Grigsby, of Virginia, the other under Colonel Stafford, of Louisiana, remained on the wooded ground off from the left of Jackson’s position. One of the regiments of Early’s brigade was left with the cavalry. Stuart retired to position corresponding to the line of Jackson’s broken front. The brigade under G. T. Anderson joined on Hood’s right, and the brigades under J. G. Walker coming up took place on Hood’s left, Walker leaving two regiments to fill a vacant place between Anderson’s brigade and Hood’s right. Walker, Hood, and D. H. Hill attacked against the Twelfth Corps; worn by its fight against Jackson, it was driven back as far as the post-and-rail fence in the east open, where they were checked. They were outside of the line, their left in the air and exposed to the fire of a thirty-gun battery posted at long range on the Hagerstown road by General Doubleday. Their left was withdrawn, and the line rectified, when Greene’s brigade of the Twelfth resumed position in the northeast angle of the wood, which it held until Sedgwick’s division came in bold march.
In these fights offensive and defensive the artillery battalions under Lieutenant-Colonel S. D. Lee and Major Frobel were in active combat, the former from the first shot made before daylight. They had been severely worked, and were nearly exhausted of ammunition. The Washington Artillery was called on for a battery to assist them, and some of the guns of that battalion were sent for ammunition. Miller’s battery of four Napoleon guns came.
As Jackson withdrew, General Hooker’s corps retired to a point on the Hagerstown road about three-quarters of a mile north of the battle-ground, where General Doubleday established his thirty-gun battery. Jackson’s and Hooker’s men had fought to exhaustion, and the battle of the Twelfth Corps, taken up and continued by Mansfield, had taken defensive relations, its chief mortally wounded.
Generals Lawton, Ripley, and J. R. Jones were severely wounded, and Colonel Douglas, commanding Lawton’s brigade, killed. A third of the men of Lawton’s, Hays’s, and Trimble’s brigades were reported killed or wounded. Four of the field officers of Colquitt’s brigade were killed, five were wounded, the tenth and last contused by a shell. All of Jackson’s and D. H. Hill’s troops engaged suffered proportionally. Hood’s, Walker’s, and G. T. Anderson’s, though longer engaged, did not lose so severely.
General Hooker’s aggregate of loss was 2590; General Mansfield’s, 1746.
The Federal batteries, of position, on the east side were more or less busy during the engagement, having occasional opportunities for a raking fire on the troops along Jackson’s line and my left. The horse artillery under Stuart was strengthening to the Confederate left, and had occasional opportunities for destructive fire across the Union right when coming into action.
Although the battle along the line of contention had become defensive, there were threatening movements on the Boonsborough pike by Sykes’s division and the horse artillery under Pleasonton, and Burnside was busy at his bridge, working to find his way across.
At the close of the Walker-Hood-Hill affair, Hood found his line making a large angle with the line of the latter, which was rectified, drawing in the angle. Early’s regiments were in the wood between Walker and the cavalry, and the detachments under Colonels Grigsby and Stafford in the wood some distance in advance of Early’s left.