Anxious as Jackson is to press on,—"Give me one hour more of daylight, and I will have United-States Ford!" cries he,—he finds that he must re-establish order in his scattered forces before he can launch this night attack upon our newly formed but stubbornly maintained lines.
Nor is the darkness the most potent influence toward this end. Illy as Sickles's advance has resulted thus far, it is now a sovereign element in the salvation of the Army of the Potomac. His force at the Furnace, Birney, Whipple, Barlow, and Pleasonton, amounts to fifteen thousand men, and over forty guns. None of these officers are the men to stand about idle. No sooner has Sickles been persuaded by a second courier,—the first he would not credit,—that the Eleventh Corps has been destroyed, and that Jackson is in his rear, than he comprehends that now, indeed, the time has come to batter Jackson's flank. He orders his column to the right about, and moves up with all speed to the clearing, where Pleasonton has held his cavalry, near Birney's old front.
Howard, upon being attacked, had sent hurriedly for a cavalry regiment. Pleasonton, having received orders to send him one, instructed Major Huey, commanding the Eighth Pennsylvania Cavalry, to march to Dowdall's and report to Howard. Huey set out by the wood road which leads through Hazel Grove into the plank road. From the testimony of the persons chiefly concerned it would appear that, at the time this order was given by Pleasonton to Huey, there was at Hazel Grove, where the cavalry regiments were drawn up, no sign whatever of the disaster to Howard. There were no fugitives nor any confusion. Nor does the evidence show that Pleasonton ordered any charge on the enemy: it rather shows that Huey was not directed to go at urgent speed. And he must have been very deliberate in his movement, for by the time the cavalry had reached the vicinity of the plank road, Jackson had demolished the Eleventh Corps, and had advanced so far that the head of this cavalry column, marching by twos, suddenly came upon the Confederate lines. The officers in the lead at once gave the order to charge, and right gallantly did these intrepid horsemen ride down into the seething mass of exultant Confederate infantry. The shock was nobly given and home, but was, of course, in the woods and against such odds, of no great effect. Thirty men and three officers, including Major Keenan, were killed. Only one Confederate report—Iverson's—mentions this charge. Its effect was local only.
Three batteries of Whipple's division had remained in the Hazel Grove clearing while the infantry had advanced towards the Furnace. When the rout of the Eleventh Corps became clear, these eighteen guns were ordered in battery, facing about north-west, by their commander, Capt. Huntington, and kept up a heavy fire upon the woods through which Jackson was pushing his way. Pleasonton, for his part, trained Martin's horse-battery in the same direction. Other guns were later added to these, and all expended a good deal of ammunition on the enemy's lines. But there was no fighting at Hazel Grove rising to the distinction of a battle. The importance given to it by Sickles and Pleasonton is not borne out by the facts. There was no Federal loss, to speak of; nor do the Confederate reports make any comment upon this phase of the battle. They probably supposed these guns to be an extension of the line of batteries at Fairview. As such they were, without question, of no inconsiderable use.
Meanwhile Birney, sending word to Barlow that they run danger of being cut off, and detailing the Twentieth Indiana and Sixty-third Pennsylvania Volunteers as rearguard, rejoins Sickles and Pleasonton in the clearing, and both move up to sustain his flank.
So soon as Jackson's guns gave Lee the intimation of his assault, the latter advanced upon the Union line with sufficient vigor to prevent Hooker from sending re-enforcements to his right. The attack was sharp; and a general inclination to the left was ordered, to connect with Jackson's right as the latter brought his columns nearer. "These orders were well executed, our troops advancing up to the enemy's intrenchments, while several batteries played with good effect upon his lines until prevented by increasing darkness." (Lee.)
McLaws reports: "My orders were to hold my position, not to engage seriously, but to press strongly so soon as it was discovered that Gen. Jackson had attacked... when I ordered an advance along the whole line to engage with the skirmishers, which were largely re-enforced, and to threaten, but not attack seriously; in doing which Gen. Wofford became so seriously engaged, that I directed him to withdraw, which was done in good order, his men in good spirits, after driving the enemy to their intrenchments."
The movement of Anderson towards the left made a gap of considerable distance in the Confederate line "but the skirmishers of Gen. Semmes, the entire Tenth Georgia, were perfectly reliable, and kept the enemy to his intrenchments."
These accounts vary in no wise from those of the Union generals, who held their positions in front of both Anderson and McLaws, and kept inside their field-works.
Meade, whose line on the left of the army was not disturbed, sent Sykes's division, so soon as the Eleventh Corps rout became known to him, to the junction of the roads to Ely's and United-States Fords, to hold that point at all hazards, and form a new right flank. This was done with Sykes's accustomed energy. Nor was he reached by Jackson's line, and before morning Reynolds fell in upon his right.