From Smoketown you will throw out pickets to Cavetown and Smithsburg. You will closely observe the movements of the enemy in that direction, and report anything of interest at once to these headquarters. The senior officer present with the force which will remain in the present camp after your departure will exercise command until your return. Very respectfully, your obedient servant,

D. McM. GREGG,

Brigadier-General of Volunteers, Comdg. Second Division.

JULY 10, 1863-10. 30 a. m.

Commanding Officer First Corps:

Brigadier-General Kenly, commanding a brigade which left Harper's Ferry to-day, is ordered to report to you with his command.

A. A. HUMPHREYS,

Major-General, and Chief of Staff.

JULY 10, 1863-10. 30 a. m.

Brigadier-General NAGLEE,

Commanding Harper's Ferry:

In future, send the re-enforcements to Boonsborough, with directions to halt there, and report their arrival to these headquarters.

A. A. HUMPHREYS,

Major-General, and Chief of Staff.

HEADQUARTERS ENGINEERS, ARMY OF THE POTOMAC,
South Mountain, July 10, 1863-10. 30 a. m.

Captain A. C. PALMER,

Engineer, Frederick, Md.:

SIR: Proceed at once to Harper's Ferry, and have loaded up on you strongest teams bridging for 200 feet. Report your arrival there, and await orders.

Respectfully,

G. K. WARREN,

Brigadier-General of Volunteers, Chief Engineer.

HEADQUARTERS ENGINEERS, ARMY OF THE POTOMAC,
July 10, 1863-10. 30 a. m.

Colonel SPAULDING,

Engineer, Harper's Ferry:

SIR: Events are yet to determine where we shall want the bridge across the Potomac, and when. Directions will be sent you in time. I have ordered the transportation train to join you, and to load up 200 feet of bridge, which we may require on the Antietam Creek.

By order:

G. K. WARREN,

Brigadier-General of Volunteers, Chief Engineer.