On the morning of the 20th of September Sheridan set out to follow Early, and in the afternoon took up a position before Strasburg, the Sixth Corps on the right, Emory on the left, and Crook behind Cedar Creek in support. The next morning, the 21st, Sheridan pushed and followed Early's skirmishers over the high hill that stands between Strasburg and Fisher's Hill, overlooking both, drove them behind the defences of Fisher's Hill, and took up a position covering the front from the banks of the North Fork on the left, where Emory's left rested lightly, to the crown of the hill just mentioned, which commanded the approach by what is called the back road, or Cedar Creek grade, and was but slightly commanded by Fisher's Hill itself. This strong vantage-ground Wright wrested from the enemy after a struggle, and felling the trees for protection and for range, planted his batteries there. The ground was very difficult, broken and rocky, and to hold it the Sixth corps had to be drawn toward the right, while Emory, following the movement, in the dark hours of the early morning of the 22d of September, extended his front so as to cover the ground thus given up by Wright.
Sheridan now thought of nothing short of the capture of Early's army. Torbert was to drive the Confederate cavalry through Luray, and thence, crossing the Massanutten range, was to lay hold of the valley pike at New Market, and plant himself firmly in Early's rear on his only line of retreat. Crook, by a wide sweep to the right, his march hidden by the hills and woods, was to gain the back road, so as to come up secretly on Early's left flank and rear, and the first sounds of battle that were certain to follow the discovery of his unexpected approach in this quarter were to serve as a signal for Wright and Emory to fall on with everything they had.
During the forenoon of the 22d, Grover held the left of the position of the Nineteenth Corps, his division formed in two lines in the order of Macauley,(1) Birge; Shunk, Molineux. Dwight, in the order of Beal, McMillan, held the right, and connected with Wheaton. In taking ground towards the right, as already described, this line had become too extended, and, as it was necessary that the left of the skirmishers, at least, should rest upon the river, Grover shortened his front by moving forward Foster with the 128th and Lewis with the 176th New York to drive in the enemy's skirmishers opposite, and to occupy the ground that they had been holding. This was handsomely done under cover of a brisk shelling from Taft's and Bradbury's guns. As on the rest of the line, the whole front of the corps was covered as usual by hasty entrenchments. In the afternoon Ricketts moved far to the right, and seized a wooded knoll commanding Ramseur's position on Fisher's Hill. In preparation for the attack Sheridan gave Emory the ground on the left of the railway, and Wright that beyond it, and Molineux moved forward to lead the advance of Grover. The sun was low when the noise of battle was heard far away on the right. This was Crook, sweeping everything before him as he charged suddenly out of the forest full upon the left flank and rear of Lomax and Ramseur, taking the whole Confederate line completely in reverse. The surprise was absolute. Instantly Wright and Emory took up the movement, and, inspired by the presence and the impetuous commands of Sheridan, descended rapidly the steep and broken sides of the ravine, at the bottom of which lies Tumbling Run, and then rather scrambling than charging up the rocky and almost inaccessible sides of Fisher's Hill, swarmed over the strong entrenchments, line after line, and planting their colors upon the parapets, saw the whole army of Early in disorderly flight. Foremost to mount the parapet was Entwistle with his company of the 176th New York. To them the good fortune fell of being the first to lay hands on four pieces of artillery in battery, abandoned in the panic caused by the appearance of Crook, but almost at the same instant Wilson, gallantly leading the 28th Iowa, planted the colors of his regiment on the works. That nothing might be wanting to the completeness of the victory, the Confederates, who, until that moment had felt their position so secure that they had even taken the ammunition boxes from the caissons, abandoned sixteen pieces of artillery where they stood. Early was unable to arrest the retreat of his army until he found himself near Edenburg, four miles beyond Woodstock.
Sheridan's loss in this battle was 52 killed, 457 wounded, 19 missing, in all, 528. Of this the Sixth Corps suffered nearly half, namely, 27 killed, 208 wounded, 3 missing, in all, 238. Crook's loss was 8 killed, 152 wounded, 2 missing, total 162, and Emory accounts for 15 killed, 86 wounded, 13 missing, together 114. All the casualties of the cavalry numbered but 14. Early reports his loss in the infantry and artillery alone as 30 killed, 210 wounded, 995 missing, total 1,235; but Sheridan claims 1,100 prisoners.
Now came Torbert's opportunity, but unfortunately, after suffering a check from the two brigades of Fitzhugh Lee under Wickham, Torbert had on the 22d fallen back down the Luray valley toward his starting-point, and when on the afternoon of the 23d word came to him of what had happened at Fisher's Hill, although he again advanced, he was then too late. Thus for once the cavalry column completely failed. Sheridan, from the tenor of his despatches to Torbert, must have felt that this result was probable, but he did not let it disturb his own movements, and without a halt he pushed forward his whole force in pursuit, with slight regard to organization, each regiment or brigade nearly in the order in which it chanced to file into the road. Devin's cavalry brigade trod closely on the heels of what was left of Lomax, and Emory, whose line had crossed the valley road, pushed up it as fast as the men could move over the ground. Wright moved in close support of Emory and personally directed the operations of both corps, the Nineteenth as well as the Sixth. So fast did the infantry march that it was ten o'clock at night before Devin, from his place in line on the right of the Sixth Corps, was able to take the road abreast with the Nineteenth, and broad daylight before his or any other horsemen passed the hardy yet toil-worn soldiers of Molineux, who were left all night to lead the swift pursuit. Molineux caused Day to deploy the 131st New York as skirmishers on the right of the road, while the 11th Indiana, led by Macauley, performed the same service on the left. About half-past eight the head of the column first came in contact with the rear-guard of the enemy, but this was soon driven in, and no further resistance was offered until about an hour later, at the crossing of a creek near Woodstock, a brisk fire of musketry, aided by two guns in the road, was opened on Molineux's front, but was quickly silenced. At dawn on the 23d of September Sheridan went into bivouac covering Woodstock, and let the infantry rest until early in the afternoon, when he again took up the pursuit with Wright and Emory, leaving Crook to care for the dead and wounded. Early fell back to Mount Jackson, and was preparing to make a stand when Averell coming up, he and Devin made so vigorous a demonstration with the cavalry alone that Early thought it best to continue his retreat beyond the North Fork to Rude's Hill, which stands between Mount Jackson and New Market.
Sheridan advanced to Mount Jackson on the morning of the 24th of September, and before nightfall had concentrated his whole army there. He was moving his cavalry to envelop both of Early's flanks and the infantry, Wright leading, to attack in front. However, Early did not wait for this, but retreated rapidly in order of battle, pursued by Sheridan in the same order, that is by the right of regiments with an attempt at deploying intervals, through New Market and six miles beyond to a point where a country road diverges through Keezeltown and Cross Keys to Port Republic, at the head of the South Fork. Here both armies halted face to face, Sheridan for the night; but Early, as soon as it was fairly dark, fell back about five miles on the Port Republic road, and again halted at a point about fourteen miles short of that town.
Early's object in quitting the main valley road, which would have conducted him to Harrisonburg, covering Staunton, was to receive once more the reinforcements that Lee, at the first tidings from Winchester, had again hurried forward under Kershaw. On the 25th of September, therefore, Early retreated through Port Republic towards Brown's Gap, where Kershaw, marching from Culpeper through Swift Run Gap, joined him on the 26th. Here also Early's cavalry rejoined him, Wickham from the Luray valley, and Lomax, pressed by Powell, from Harrisonburg.
Sheridan, keeping to the main road, advanced to Harrisonburg with Wright and Emory, leaving Crook to hold the fork of the roads where Early had turned off. At Harrisonburg Torbert rejoined with Merritt and Wilson. Then Sheridan sent Torbert with Wilson and Lowell by Staunton to Waynesboro', where, before quitting the valley by Rockfish Gap, the major road, as well as the railway to Charlottesville, crossed the affluent of the Shenandoah known as the South River. To divert attention from this raid Sheridan reinforced Devin, who, in the absence of Torbert's main body, had been following and observing Early near Port Republic without other cavalry support, and thus Merritt presently ran into Kershaw marching to join Early at Brown's Gap. Early, having gone as far as he wished, turned upon Merritt and drove him across the South Fork, but just then getting the first inkling of Torbert's movements, divined their purpose, and, to check them, marched with all speed, in compact order and with the greatest watchfulness in every direction, on Rockfish Gap. But Torbert, having a good start, won the race, and had accomplished his object when the advance of Early's column came up, and caused him to draw off.
Sheridan, on his part, had gone nearly as far as he intended, but as he meant presently to begin with his cavalry above Staunton the work of destroying the value of the whole valley to the Confederate army, on the 29th he ordered Wright and Emory to Mount Crawford to support Torbert in this work.
Grant, who, ever since he reached the James, had cast longing eyes upon the Virginia Central railway, as well as upon the great junction at Gordonsville, now strongly desired Sheridan to go to Staunton or Charlottesville, but Sheridan set himself firmly against the plan on account of the daily increasing difficulty of supplying his army and the great force that must be wasted in any attempt to keep open a line of communication longer or more exposed than that he already had to maintain. As an alternative, Sheridan, who seems to have thought Early had quitted the valley for good, proposed to bring the Valley campaign to an end with the destruction of the crops, and then to move with his main force to join Grant on the James. Grant, at once agreeing to this, directed Sheridan to keep Crook in the valley and to transfer the rest of his force to the armies before Richmond.