On the 16th the enemy, to reinforce Petersburg, withdrew from a part of his intrenchment in front of Bermuda Hundred, expecting, no doubt, to get troops from north of the James to take the place of those withdrawn before we could discover it. General Butler, taking advantage of this, at once moved a force on the railroad between Petersburg and Richmond. As soon as I was apprised of the advantage thus gained, to retain it I ordered two divisions of the 6th corps, General Wright commanding, that were embarking at Wilcox's Landing, under orders for City Point, to report to General Butler at Bermuda Hundred, of which General Butler was notified, and the importance of holding a position in advance of his present line urged upon him.
About two o'clock in the afternoon General Butler was forced back to the line the enemy had withdrawn from in the morning. General Wright, with his two divisions, joined General Butler on the forenoon of the 17th, the latter still holding with a strong picket-line the enemy's works. But instead of putting these divisions into the enemy's works to hold them, he permitted them to halt and rest some distance in the rear of his own line. Between four and five o'clock in the afternoon the enemy attacked and drove in his pickets and re-occupied his old line.
On the night of the 20th and morning of the 21st a lodgment was effected by General Butler, with one brigade of infantry, on the north bank of the James, at Deep Bottom, and connected by pontoon-bridge with Bermuda Hundred.
On the 19th, General Sheridan, on his return from his expedition against the Virginia Central Railroad, arrived at the White House just as the enemy's cavalry was about to attack it, and compelled it to retire. The result of this expedition was, that General Sheridan met the enemy's cavalry near Trevilian Station, on the morning of the 11th of June, whom he attacked, and after an obstinate contest drove from the field in complete rout. He left his dead and nearly all his wounded in our hands, and about four hundred prisoners and several hundred horses. On the 12th he destroyed the railroad from Trevilian Station to Louisa Court House. This occupied until three o'clock P.M., when he advanced in the direction of Gordonsville. He found the enemy reinforced by infantry, behind well-constructed rifle-pits, about five miles from the latter place and too strong to successfully assault. On the extreme right, however, his reserve brigade carried the enemy's works twice, and was twice driven therefrom by infantry. Night closed the contest. Not having sufficient ammunition to continue the engagement, and his animals being without forage (the country furnishing but inferior grazing), and hearing nothing from General Hunter, he withdrew his command to the north side of the North Anna, and commenced his return march, reaching White House at the time before stated. After breaking up the depot at that place, he moved to the James River, which he reached safely after heavy fighting. He commenced crossing on the 25th, near Fort Powhatan, without further molestation, and rejoined the Army of the Potomac.
On the 22d, General Wilson, with his own division of cavalry of the Army of the Potomac, and General Kautz's division of cavalry of the Army of the James moved against the enemy's railroads south of Richmond. Striking the Weldon Railroad at Reams's Station, destroying the depot and several miles of the road, and the South Side road about fifteen miles from Petersburg, to near Nottoway Station, where he met and defeated a force of the enemy's cavalry. He reached Burkesville Station on the afternoon of the 23d, and from there destroyed the Danville Railroad to Roanoke Bridge, a distance of twenty-five miles, where he found the enemy in force, and in a position from which he could not dislodge him. He then commenced his return march, and on the 28th met the enemy's cavalry in force at the Weldon Railroad crossing of Stony Creek, where he had a severe but not decisive engagement. Thence he made a detour from his left with a view of reaching Reams's Station (supposing it to be in our possession). At this place he was met by the enemy's cavalry, supported by infantry, and forced to retire, with the loss of his artillery and trains. In this last encounter, General Kautz, with a part of his command, became separated, and made his way into our lines. General Wilson, with the remainder of his force, succeeded in crossing the Nottoway River and coming in safely on our left and rear. The damage to the enemy in this expedition more than compensated for the losses we sustained. It severed all connection by railroad with Richmond for several weeks.
With a view of cutting the enemy's railroad from near Richmond to the Anna rivers, and making him wary of the situation of his army in the Shenandoah, and, in the event of failure in this, to take advantage of his necessary withdrawal of troops from Petersburg, to explode a mine that had been prepared in front of the 9th corps and assault the enemy's lines at that place, on the night of the 26th of July the 2d corps and two divisions of the cavalry corps and Kautz's cavalry were crossed to the north bank of the James River and joined the force General Butler had there. On the 27th the enemy was driven from his intrenched position, with the loss of four pieces of artillery. On the 28th our lines were extended from Deep Bottom to New Market Road, but in getting this position were attacked by the enemy in heavy force. The fighting lasted for several hours, resulting in considerable loss to both sides. The first object of this move having failed, by reason of the very large force thrown there by the enemy, I determined to take advantage of the diversion made, by assaulting Petersburg before he could get his force back there. One division of the 2d corps was withdrawn on the night of the 28th, and moved during the night to the rear of the 18th corps, to relieve that corps in the line, that it might be foot-loose in the assault to be made. The other two divisions of the 2d corps and Sheridan's cavalry were crossed over on the night of the 29th and moved in front of Petersburg. On the morning of the 30th, between four and five o'clock, the mine was sprung, blowing up a battery and most of a regiment, and the advance of the assaulting column, formed of the 9th corps, immediately took possession of the crater made by the explosion, and the line for some distance to the right and left of it, and a detached line in front of it, but for some cause failed to advance promptly to the ridge beyond. Had they done this, I have every reason to believe that Petersburg would have fallen. Other troops were immediately pushed forward, but the time consumed in getting them up enabled the enemy to rally from his surprise (which had been complete), and get forces to this point for its defence. The captured line thus held being untenable, and of no advantage to us, the troops were withdrawn, but not without heavy loss. Thus terminated in disaster what promised to be the most successful assault of the campaign.
Immediately upon the enemy's ascertaining that General Hunter was retreating from Lynchburg by way of the Kanawha River, thus laying the Shenandoah Valley open for raid into Maryland and Pennsylvania, he returned northward and moved down that valley. As soon as this movement of the enemy was ascertained, General Hunter, who had reached the Kanawha River, was directed to move his troops without delay, by river and railroad, to Harper's Ferry; but owing to the difficulty of navigation by reason of low water and breaks in the railroad, great delay was experienced in getting there. It became necessary, therefore, to find other troops to check this movement of the enemy. For this purpose the 6th corps was taken from the armies operating against Richmond, to which was added the 19th corps, then fortunately beginning to arrive in Hampton Roads from the Gulf Department, under orders issued immediately after the ascertainment of the result of the Red River expedition. The garrisons of Baltimore and Washington were at this time made up of heavy-artillery regiments, hundred days' men, and detachments from the invalid corps. One division under command of General Ricketts, of the 6th corps, was sent to Baltimore, and the remaining two divisions of the 6th corps, under General Wright, were subsequently sent to Washington. On the 3d of July the enemy approached Martinsburg. General Sigel, who was in command of our forces there, retreated across the Potomac at Shepherdtown; and General Weber, commanding at Harper's Ferry, crossed the occupied Hagerstown, moving a strong column towards Frederick City. General Wallace, with Rickett's division and his own command, the latter mostly new and undisciplined troops, pushed out from Baltimore with great promptness, and met the enemy in force on the Monocacy, near the crossing of the railroad bridge. His force was not sufficient to insure success, but he fought the enemy nevertheless, and although it resulted in a defeat to our arms, yet it detained the enemy, and thereby served to enable General Wright to reach Washington with two division of the 6th corps, and the advance of the 19th corps, before him. From Monocacy the enemy moved on Washington, his cavalry advance reaching Rockville on the evening of the 10th. On the 12th a reconnoissance was thrown out in front of Fort Stevens, to ascertain the enemy's position and force. A severe skirmish ensued, in which we lost about two hundred and eighty in killed and wounded. The enemy's loss was probably greater. He commenced retreating during the night. Learning the exact condition of affairs at Washington, I requested by telegraph, at forty-five minutes past eleven P.M., on the 12th, the assignment of Major-General H. G. Wright to the command of all the troops that could be made available to operate in the field against the enemy, and directed that he should get outside of the trenches with all the force he could, and push Early to the last moment. General Wright commenced the pursuit on the 13th; on the 18th the enemy was overtaken at Snicker's Ferry, on the Shenandoah, when a sharp skirmish occurred; and on the 20th, General Averell encountered and defeated a portion of the rebel army at Winchester, capturing four pieces of artillery and several hundred prisoners.
Learning that Early was retreating south towards Lynchburg or Richmond, I directed that the 6th and 19th corps be got back to the armies operating against Richmond, so that they might be used in a movement against Lee before the return of the troops sent by him into the valley; and that Hunter should remain in the Shenandoah Valley, keeping between any force of the enemy and Washington, acting on the defensive as much as possible. I felt that if the enemy had any notion of returning, the fact would be developed before the 6th and 19th corps could leave Washington. Subsequently, the 19th corps was excepted form the order to return to the James.
About the 25th it became evident that the enemy was again advancing upon Maryland and Pennsylvania, and the 6th corps, then at Washington, was ordered back to the vicinity of Harper's Ferry. The rebel force moved down the valley, and sent a raiding party into Pennsylvania which on the 30th burned Chambersburg, and then retreated, pursued by our cavalry, towards Cumberland. They were met and defeated by General Kelley, and with diminished numbers escaped into the mountains of West Virginia. From the time of the first raid the telegraph wires were frequently down between Washington and City Point, making it necessary to transmit messages a part of the way by boat. It took from twenty-four to thirty-six hours to get dispatches through and return answers would be received showing a different state of facts from those on which they were based, causing confusion and apparent contradiction of orders that must have considerably embarrassed those who had to execute them, and rendered operations against the enemy less effective than they otherwise would have been. To remedy this evil, it was evident to my mind that some person should have the supreme command of all the forces in the Department of West Virginia, Washington, Susquehanna, and the Middle Department, and I so recommended.
On the 2d of August, I ordered General Sheridan to report in person to Major-General Halleck, chief of staff, at Washington, with a view to his assignment to the command of all the forces against Early. At this time the enemy was concentrated in the neighborhood of Winchester, while our forces, under General Hunter, were concentrated on the Monocacy, at the crossing of the Baltimore and Ohio Railroad, leaving open to the enemy Western Maryland and Southern Pennsylvania. From where I was, I hesitated to give positive orders for the movement of our forces at Monocacy, lest by so doing I should expose Washington. Therefore, on the 4th, I left City Point to visit Hunter's command, and determine for myself what was best to be done. On arrival there, and after consultation with General Hunter, I issued to him the following instructions: