FORT MONROE, August 20, 1862 - 3 p. m.

Major-General HEINTZELMAN, Yorktown:

As soon as you reach Aquia please telegraph General Halleck before disembarking. It is possible that he may give your orders to go to Alexandria. Have not yet received such.

GEO. B. MCCLELLAN,

Major-General, Commanding.

[Indorsement.]

General Kearny will please telegraph General Halleck as soon as he arrives at Aquia, and obey such instructions as he may receive.

By command of General Heintzelman:

CHAUNCEY MCKEEVER,

Assistant Adjutant-General.

FORT MONROE, August 20, 1862 - 4.45 p. m.

(Received 21st, 9.10 a. m.)

Major General H. W. HALLECK,

General-in-Chief:

Nothing new up to present hour. Heintzelman is getting on well. All of Porter's corps will be under way before dark. No transports shall be left idle. Have been delayed by many vessels coming without water. Shall all go to Aquia?

GEO. B. MCCLELLAN,

Major-General.

HEADQUARTERS ARMY OF THE POTOMAC,
Fort Monroe, August 20, 1862 - 7 p. m.

Major General E. V. SUMNER,

Commanding Second Corps, Yorktown:

Please move to-morrow morning to Newport News with one of your divisions, marching the other to Hampton; your artillery to the latter place. The division destined for Newport News should move by Warwick Court-House and Young's Mill; the other by Big Bether. Divide the distance into two marches, reaching the destination day after tomorrow morning. It is probable that means will be ready for your troops to commence embarking the day after you reach here. I heard from Washington yesterday that Jackson was crossing the Rapidan.

GEO. B. MCCLELLAN,

Major-General.

FORT MONROE, August 20, 1862 - 10 p. m.

(Received August 21, 9.10 a. m.)

Major General H. W. HALLECK,

General-in-Chief:

Have just heard from Yorktown that the whole of Heintzelman's corps will certainly be off to-morrow. Nothing else of interest to report to you.

GEO. B. MCCLELLAN,

Major-General, Commanding.