1 p. m. to-day. The commanding general directs you to hold yourself in readiness to move in the same direction as soon as events have developed themselves here and at Williamsport.

I am, general, very respectfully, your obedient servant,

R. B. MARCY,

Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 20, 1862--7 p. m.

Brigadier-General PLEASONTON:

GENERAL: The commanding general directs you to send one horse battery with the brigade of cavalry to be sent to General Couch. He also directs you to send two small regiments of cavalry and one horse battery to report to General F. J. Porter at daylight to-morrow morning. The officer who is to command the troops for General Porter will report to him to-night. General Franklin is directed to send Couch one division as re-enforcements.

I am, general, &c.,

R. B. MARCY,

Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 21, 1862.

General MEADE,

Commanding Army Corps:

GENERAL: The commanding general directs that you march your corps at 9 o'clock to-morrow morning, via Rohresville and Brownsville, to a point opposite Harper's Ferry, and report your arrival at that point to these headquarters. General Sumner will march for the same place at daylight to-morrow, but will march by the river road. Please take supplies sufficient to last till you can send to the railroad terminus for others. You will remove your camp permanently.

Very respectfully,

R. B. MARCY,

Chief of Staff.

(Countermanded same date.)

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
Camp near the Potomac, September 21, 1862--4.30 p. m.

Major General E. V. SUMNER,

Commanding Corps:

GENERAL: The commanding general directs that you get your command in readiness to move at daylight to-morrow morning to a point opposite Harper's Ferry, where you will remain until a pontoon bridge is placed across the river. You will then pass over the river and occupy Loudoun and Bolivar Heights and Harper's Ferry. After accomplishing this you will direct the corps commanded by General Williams to cross the river and place it in position. You will please march by way of Sharpsburg, thence following the road which runs nearest to the Potomac. You will take steps to-night to procure supplies to last you until you can get them by the Baltimore and Ohio Railroad at Harper's Ferry.

Yours, very respectfully,

R. B. MARCY,

Chief of Staff.

[19.]