"When you are notified to move, take City Point with as much force as possible. Fortify, or rather intrench, at once, and concentrate all your troops for the field there as rapidly as you can. From City Point directions cannot be given at this time for your further movements.
"The fact that has already been stated—that is, that Richmond is to be your objective point, and that there is to be co-operation between your force and the Army of the Potomac—must be your guide. This indicates the necessity of your holding close to the south bank of the James River as you advance. Then, should the enemy be forced into his intrenchments in Richmond, the Army of the Potomac would follow, and by means of transports the two armies would become a unit.
"All the minor details of your advance are left entirely to your direction. If, however, you think it practicable to use your cavalry south of you, so as to cut the railroad about Hicksford, about the time of the general advance, it would be of immense advantage.
"You will please forward for my information, at the earliest practicable day, all orders, details, and instructions you may give for the execution of this order.
"U. S. GRANT, Lieutenant-General.
"MAJOR-GENERAL B. F. BUTLER."
On the 16th these instructions were substantially reiterated. On the 19th, in order to secure full co-operation between his army and that of General Meade, he was informed that I expected him to move from Fort Monroe the same day that General Meade moved from Culpeper. The exact time I was to telegraph him as soon as it was fixed, and that it would not be earlier than the 27th of April; that it was my intention to fight Lee between Culpeper and Richmond, if he would stand. Should he, however, fall back into Richmond, I would follow up and make a junction with his (General Butler's) army on the James River; that, could I be certain he would be able to invest Richmond on the south side, so as to have his left resting on the James, above the city, I would form the junction there; that circumstances might make this course advisable anyhow; that he should use every exertion to secure footing as far up the south side of the river as he could, and as soon as possible after the receipt of orders to move; that if he could not carry the city, he should at least detain as large a force there as possible.
In co-operation with the main movements against Lee and Johnston, I was desirous of using all other troops necessarily kept in departments remote from the fields of immediate operations, and also those kept in the background for the protection of our extended lines between the loyal States and the armies operating against them.
A very considerable force, under command of Major-General Sigel, was so held for the protection of West Virginia, and the frontiers of Maryland and Pennsylvania. Whilst these troops could not be withdrawn to distant fields without exposing the North to invasion by comparatively small bodies of the enemy, they could act directly to their front, and give better protection than if lying idle in garrison. By such a movement they would either compel the enemy to detach largely for the protection of his supplies and lines of communication, or he would lose them. General Sigel was therefore directed to organize all his available force into two expeditions, to move from Beverly and Charleston, under command of Generals Ord and Crook, against the East Tennessee and Virginia Railroad. Subsequently, General Ord having been relieved at his own request, General Sigel was instructed at his own suggestion, to give up the expedition by Beverly, and to form two columns, one under General Crook, on the Kanawha, numbering about ten thousand men, and one on the Shenandoah, numbering about seven thousand men. The one on the Shenandoah to assemble between Cumberland and the Shenandoah, and the infantry and artillery advanced to Cedar Creek with such cavalry as could be made available at the moment, to threaten the enemy in the Shenandoah Valley, and advance as far as possible; while General Crook would take possession of Lewisburg with part of his force and move down the Tennessee Railroad, doing as much damage as he could, destroying the New River Bridge and the salt-works, at Saltville, Va.
Owing to the weather and bad condition of the roads, operations were delayed until the 1st of May, when, everything being in readiness and the roads favorable, orders were given for a general movement of all the armies not later than the 4th of May.
My first object being to break the military power of the rebellion, and capture the enemy's important strongholds, made me desirous that General Butler should succeed in his movement against Richmond, as that would tend more than anything else, unless it were the capture of Lee's army, to accomplish this desired result in the East. If he failed, it was my determination, by hard fighting, either to compel Lee to retreat, or to so cripple him that he could not detach a large force to go north, and still retain enough for the defence of Richmond. It was well understood, by both Generals Butler and Meade, before starting on the campaign, that it was my intention to put both their armies south of the James River, in case of failure to destroy Lee without it.