COLD HARBOR, VA., June 11, 1864.

MAJOR-GEN. B. F. BUTLER,
Commanding Department of Va. and N. C.

The movement to transfer this army to the south side of the James River will commence after dark to-morrow night. Col. Comstock, of my staff, was sent specially to ascertain what was necessary to make your position secure in the interval during which the enemy might use most of his force against you, and also, to ascertain what point on the river we should reach to effect a crossing if it should not be practicable to reach this side of the river at Bermuda Hundred. Colonel Comstock has not yet returned, so that I cannot make instructions as definite as I would wish, but the time between this and Sunday night being so short in which to get word to you, I must do the best I can. Colonel Dent goes to the Chickahominy to take to you the 18th corps. The corps will leave its position in the trenches as early in the evening, tomorrow, as possible, and make a forced march to Cole's Landing or Ferry, where it should reach by ten A.M. the following morning. This corps numbers now 15,300 men. They take with them neither wagons nor artillery; these latter marching with the balance of the army to the James River. The remainder of the army will cross the Chickahominy at Long Bridge and at Jones's, and strike the river at the most practicable crossing below City Point.

I directed several days ago that all reinforcements for the army should be sent to you. I am not advised of the number that may have gone, but suppose you have received from six to ten thousand. General Smith will also reach you as soon as the enemy could, going by the way of Richmond.

The balance of the force will not be more than one day behind, unless detained by the whole of Lee's army, in which case you will be strong enough.

I wish you would direct the proper staff officers, your chief-engineer and your chief-quartermaster, to commence at once the collection of all the means in their reach for crossing the army on its arrival. If there is a point below City Point where a pontoon bridge can be thrown, have it laid.

Expecting the arrival of the 18th corps by Monday night, if you deem it practicable from the force you have to seize and hold Petersburg, you may prepare to start, on the arrival of troops to hold your present lines. I do not want Petersburg visited, however, unless it is held, nor an attempt to take it, unless you feel a reasonable degree of confidence of success. If you should go there, I think troops should take nothing with them except what they can carry, depending upon supplies being sent after the place is secured. If Colonel Dent should not succeed in securing the requisite amount of transportation for the 18th corps before reaching you, please have the balance supplied.

U. S. GRANT,
Lieut.-General.

P. S.—On reflection I will send the 18th corps by way of White House. The distance which they will have to march will be enough shorter to enable them to reach you about the same time, and the uncertainty of navigation on the Chickahominy will be avoided.

U. S. GRANT.

COLD HARBOR, VA., June 11,1864.

MAJOR-GENERAL G. G. MEADE,
Commanding Army of the Potomac.

Colonel Comstock, who visited the James River for the purpose of ascertaining the best point below Bermuda Hundred to which to march the army has not yet returned. It is now getting so late, however, that all preparations may be made for the move to-morrow night without waiting longer.

The movement will be made as heretofore agreed upon, that is, the 18th corps make a rapid march with the infantry alone, their wagons and artillery accompanying the balance of the army to Cole's Landing or Ferry, and there embark for City Point, losing no time for rest until they reach the latter point.

The 5th corps will seize Long Bridge and move out on the Long Bridge Road to its junction with Quaker Road, or until stopped by the enemy.

The other three corps will follow in such order as you may direct, one of them crossing at Long Bridge, and two at Jones's Bridge. After the crossing is effected, the most practicable roads will be taken to reach about Fort Powhattan. Of course, this is supposing the enemy makes no opposition to our advance. The 5th corps, after securing the passage of the balance of the army, will join or follow in rear of the corps which crosses the same bridge with themselves. The wagon trains should be kept well east of the troops, and if a crossing can be found, or made lower down than Jones's they should take it.

U. S. GRANT,
Lieut.-General.

P. S.—In view of the long march to reach Cole's Landing, and the uncertainty of being able to embark a large number of men there, the direction of the 18th corps may be changed to White House. They should be directed to load up transports, and start them as fast as loaded without waiting for the whole corps or even whole divisions to go together.

U. S. GRANT.

About this time word was received (through the Richmond papers of the 11th) that Crook and Averell had united and were moving east. This, with the news of Hunter's successful engagement near Staunton, was no doubt known to Lee before it was to me. Then Sheridan leaving with two divisions of cavalry, looked indeed threatening, both to Lee's communications and supplies. Much of his cavalry was sent after Sheridan, and Early with Ewell's entire corps was sent to the Valley. Supplies were growing scarce in Richmond, and the sources from which to draw them were in our hands. People from outside began to pour into Richmond to help eat up the little on hand. Consternation reigned there.

On the 12th Smith was ordered to move at night to White House, not to stop until he reached there, and to take boats at once for City Point, leaving his trains and artillery to move by land.

Soon after dark some of the cavalry at Long Bridge effected a crossing by wading and floundering through the water and mud, leaving their horses behind, and drove away the cavalry pickets. A pontoon bridge was speedily thrown across, over which the remainder of the army soon passed and pushed out for a mile or two to watch and detain any advance that might be made from the other side. Warren followed the cavalry, and by the morning of the 13th had his whole corps over. Hancock followed Warren. Burnside took the road to Jones's Bridge, followed by Wright. Ferrero's division, with the wagon train, moved farther east, by Window Shades and Cole's Ferry, our rear being covered by cavalry.

It was known that the enemy had some gunboats at Richmond. These might run down at night and inflict great damage upon us before they could be sunk or captured by our navy. General Butler had, in advance, loaded some vessels with stone ready to be sunk so as to obstruct the channel in an emergency. On the 13th I sent orders to have these sunk as high up the river as we could guard them, and prevent their removal by the enemy.

As soon as Warren's corps was over the Chickahominy it marched out and joined the cavalry in holding the roads from Richmond while the army passed. No attempt was made by the enemy to impede our march, however, but Warren and Wilson reported the enemy strongly fortified in their front. By the evening of the 13th Hancock's corps was at Charles City Court House on the James River. Burnside's and Wright's corps were on the Chickahominy, and crossed during the night, Warren's corps and the cavalry still covering the army. The material for a pontoon bridge was already at hand and the work of laying it was commenced immediately, under the superintendence of Brigadier-General Benham, commanding the engineer brigade. On the evening of the 14th the crossing commenced, Hancock in advance, using both the bridge and boats.

When the Wilderness campaign commenced the Army of the Potomac, including Burnside's—which was a separate command until the 24th of May when it was incorporated with the main army—numbered about 116,000 men. During the progress of the campaign about 40,000 reinforcements were received. At the crossing of the James River June 14th-15th the army numbered about 115,000. Besides the ordinary losses incident to a campaign of six weeks' nearly constant fighting or skirmishing, about one-half of the artillery was sent back to Washington, and many men were discharged by reason of the expiration of their term of service. In estimating our strength every enlisted man and every commissioned officer present is included, no matter how employed; in bands, sick in field hospitals, hospital attendants, company cooks and all. Operating in an enemy's country, and being supplied always from a distant base, large detachments had at all times to be sent from the front, not only to guard the base of supplies and the roads to it, but all the roads leading to our flanks and rear. We were also operating in a country unknown to us, and without competent guides or maps showing the roads accurately.

The manner of estimating numbers in the two armies differs materially. In the Confederate army often only bayonets are taken into account, never, I believe, do they estimate more than are handling the guns of the artillery and armed with muskets or carbines. Generally the latter are far enough away to be excluded from the count in any one field. Officers and details of enlisted men are not included. In the Northern armies the estimate is most liberal, taking in all connected with the army and drawing pay.

FROM A STATEMENT OF LOSSES COMPILED IN THE ADJUTANT-GENERAL'S OFFICE.

FIELD OF ACTION AND DATE.KILLED.WOUNDED.MISSING.AGGREGATE.
Wilderness, May 5th to 7th2,2618,7852,90213,948
Spottsylvania, May 8th to 21st2,2719,3601,97013,601
North Anna, May 23d to 27th1867921651,143
Totopotomoy, May 27th to 31st9935852509
Cold Harbor, May 31st to June 12th 1,7696,7521,53710,058
Total ...........................6,58626,0476,62639,259