and send out some cavalry to direct them where to go. The trains of General Pope's army are now coming in. No delay must be made in executing this order, and the cavalry must continue on the duty all night.

R. B. MARCY,

Chief of Staff.

[12.]

HEADQUARTERS,
Washington, September 1, 1862.

General S. WILLIAMS,

Assistant Adjutant-General, near Alexandria:

The commanding general desires to procure the return to his headquarters of Major Haller's command, and the regulars of late Willard's battalion, and begs you to take the necessary steps to secure this object. He wishes you to request General Burnside by telegraph to instruct Captain McIntyre's squadron to report to him (General McClellan), immediately upon its arrival from Aquia. The general has decided to drop the heading "Army of the Potomac," and to say from the present simply "Headquarters."

JAS. A. HARDIE,

Lieutenant-Colonel and Aide-de-Camp.

[12.]

HEADQUARTERS,
Washington, September 1, 1862.

General WILLIAMS,

Assistant Adjutant-General, Headquarters near Alexandria:

Telegraphic communication with General Cox will do. No hurry about that. The general does not wish the batteries of Sumner's corps to move to the front, nor any wagon trains whatever on the Little River turnpike toward Fairfax Court-House. Any trains which may be within a reasonable distance of Alexandria may be stopped and got into position, if possible, to move either way. Abercrombie's brigade will prepare itself to march at short notice, but will await orders.

By command:

JAS. A. HARDIE,

Lieutenant-Colonel and Aide-de-Camp.

[12.]

HEADQUARTERS,
September 1, 1862-8.40 p. M.

General S. WILLIAMS,

Assistant Adjutant-General, Headquarters near Alexandria:

General McClellan desires you to inform Colonel Robert Williams that his command should be disembarked and prepared for immediate service as rapidly as possible. As soon as his command id disembarked and ready to move he is report to General McClellan by telegraph. Please also direct Captain Howard to repair here at an early hour to-morrow to make arrangements with Colonel Rucker, assistant quartermaster, for a temporary office, storage for camp equipage, place for parking wagons, grounds for camp of headquarters troops, &c. It is desired to move the headquarters in as soon as possible. Captain Howard should report to General Marcy at 9 a. M.

JAS. A. HARDIE,

Lieutenant-Colonel, Aide-de-Camp, and Actg. Asst. Adjt. General

[12.]