"MONOCACY BRIDGE, MARYLAND,
August 5, 1864—8 P.M."GENERAL:—Concentrate all your available force without delay in the vicinity of Harper's Ferry, leaving only such railroad guards and garrisons for public property as may be necessary. Use, in this concentrating, the railroad, if by so doing time can be saved. From Harper's Ferry, if it is found that the enemy has moved north of the Potomac in large force, push north, following him and attacking him wherever found; follow him, if driven south of the Potomac, as long as it is safe to do so. If it is ascertained that the enemy has but a small force north of the Potomac, then push south with the main force, detaching under a competent commander, a sufficient force to look after the raiders, and drive them to their homes. In detaching such a force, the brigade of the cavalry now en route from Washington via Rockville may be taken into account.
"There are now on their way to join you three other brigades of the best cavalry, numbering at least five thousand men and horses. These will be instructed, in the absence of further orders, to join you by the south side of the Potomac. One brigade will probably start to-morrow. In pushing up the Shenandoah Valley, where it is expected you will have to go first or last, it is desirable that nothing should be left to invite the enemy to return. Take all provisions, forage, and stock wanted for the use of your command; such as cannot be consumed, destroy. It is not desirable that the buildings should be destroyed—they should rather be protected; but the people should be informed that, so long as an army can subsist among them, recurrence of theses raids must be expected, and we are determined to stop them at all hazards.
"Bear in mind, the object is to drive the enemy south; and to do this you want to keep him always in sight. Be guided in your course by the course he takes.
"Make your own arrangements for supplies of all kinds, giving regular vouchers for such as may be taken from loyal citizens in the country through which you march.
"U. S. GRANT, Lieutenant-General.
"MAJOR-GENERAL D. HUNTER."
The troops were immediately put in motion, and the advance reached Halltown that night.
General Hunter having, in our conversation, expressed a willingness to be relieved from command, I telegraphed to have General Sheridan, then at Washington, sent to Harper's Ferry by the morning train, with orders to take general command of all the troops in the field, and to call on General Hunter at Monocacy, who would turn over to him my letter of instructions. I remained at Monocacy until General Sheridan arrived, on the morning of the 6th, and, after a conference with him in relation to military affairs in that vicinity, I returned to City Point by way of Washington.
On the 7th of August, the Middle Department, and the Departments of West Virginia, Washington, and Susquehanna, were constituted into the "Middle Military Division," and Major-General Sheridan was assigned to temporary command of the same.
Two divisions of cavalry, commanded by Generals Torbert and Wilson, were sent to Sheridan from the Army of the Potomac. The first reached him at Harper's Ferry about the 11th of August.
His operations during the month of August and the fore part of September were both of an offensive and defensive character, resulting in many severe skirmishes, principally by the cavalry, in which we were generally successful, but no general engagement took place. The two armies lay in such a position—the enemy on the west bank of the Opequon Creek covering Winchester, and our forces in front of Berryville—that either could bring on a battle at any time. Defeat to us would lay open to the enemy the States of Maryland and Pennsylvania for long distances before another army could be interposed to check him. Under these circumstances I hesitated about allowing the initiative to be taken. Finally, the use of the Baltimore and Ohio Railroad, and the Chesapeake and Ohio Canal, which were both obstructed by the enemy, became so indispensably necessary to us, and the importance of relieving Pennsylvania and Maryland from continuously threatened invasion so great, that I determined the risk should be taken. But fearing to telegraph the order for an attack without knowing more than I did of General Sheridan's feelings as to what would be the probable result, I left City Point on the 15th of September to visit him at his headquarters, to decide, after conference with him, what should be done. I met him at Charlestown, and he pointed out so distinctly how each army lay; what he could do the moment he was authorized, and expressed such confidence of success, that I saw there were but two words of instructions necessary—Go in! For the conveniences of forage, the teams for supplying the army were kept at Harper's Ferry. I asked him if he could get out his teams and supplies in time to make an attack on the ensuing Tuesday morning. His reply was, that he could before daylight on Monday. He was off promptly to time, and I may here add, that the result was such that I have never since deemed it necessary to visit General Sheridan before giving him orders.
Early on the morning of the 19th, General Sheridan attacked General Early at the crossing on the Opequon Creek, and after a most sanguinary and bloody battle, lasting until five o'clock in the evening, defeated him with heavy loss, carrying his entire position from Opequon Creek to Winchester, capturing several thousand prisoners and five pieces of artillery. The enemy rallied, and made a stand in a strong position at Fisher's Hill, where he was attacked, and again defeated with heavy loss on the 20th [22d]. Sheridan pursued him with great energy through Harrisonburg, Staunton, and the gaps of the Blue Ridge. After stripping the upper valley of most of the supplies and provisions for the rebel army, he returned to Strasburg, and took position on the north side of Cedar Creek.
Having received considerable reinforcements, General Early again returned to the valley, and, on the 9th of October, his cavalry encountered ours near Strasburg, where the rebels were defeated, with the loss of eleven pieces of artillery and three hundred and fifty prisoners. On the night of the 18th, the enemy crossed the mountains which separate the branches of the Shenandoah, forded the North Fork, and early on the morning of the 19th, under cover of the darkness and the fog, surprised and turned our left flank, and captured the batteries which enfiladed our whole line. Our troops fell back with heavy loss and in much confusion, but were finally rallied between Middletown and Newtown. At this juncture, General Sheridan, who was at Winchester when the battle commenced arrived on the field, arranged his lines just in time to repulse a heavy attack of the enemy, and immediately assuming the offensive, he attacked in turn with great vigor. The enemy was defeated with great slaughter, and the loss of most of his artillery and trains, and the trophies he had captured in the morning. The wreck of his army escaped during the night, and fled in the direction of Staunton and Lynchburg. Pursuit was made to Mount Jackson. Thus ended this, the enemy's last attempt to invade the North via the Shenandoah Valley. I was now enabled to return the 6th corps to the Army of the Potomac, and to send one division from Sheridan's army to the Army of the James, and another to Savannah, Georgia, to hold Sherman's new acquisitions on the sea-coast, and thus enable him to move without detaching from his force for that purpose.
Reports from various sources led me to believe that the enemy had detached three divisions from Petersburg to reinforce Early in the Shenandoah Valley. I therefore sent the 2d corps and Gregg's division of cavalry, of the Army of the Potomac, and a force of General Butler's army, on the night of the 13th of August, to threaten Richmond from the north side of the James, to prevent him from sending troops away, and, if possible, to draw back those sent. In this move we captured six pieces of artillery and several hundred prisoners, detained troops that were under marching orders, and ascertained that but one division (Kershaw's), of the three reputed detached, had gone.
The enemy having withdrawn heavily from Petersburg to resist this movement, the 5th corps, General Warren commanding, was moved out on the 18th, and took possession of the Weldon Railroad. During the day he had considerable fighting. To regain possession of the road, the enemy made repeated and desperate assaults, but was each time repulsed with great loss. On the night of the 20th, the troops on the north side of the James were withdrawn, and Hancock and Gregg returned to the front at Petersburg. On the 25th, the 2d corps and Gregg's division of cavalry, while at Reams's Station destroying the railroad, were attacked, and after desperate fighting, a part of our line gave way, and five pieces of artillery fell into the hands of the enemy.