HEADQUARTERS ARMY OF THE POTOMAC,
Washington, September 1, 1862.

General S. WILLIAMS,

Headquarters near Alexandria:

Do not let the batteries of Sumner's corps proceed to the front until further orders.

JAS. A. HARDIE,

Lieutenant-Colonel and Aide-de-Camp.

[12.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 1, 1862.

Brigadier General S. WILLIAMS,

Assistant Adjutant-General:

Lieutenant-Colonel Warner should get his ammunition early in the morning, and then move out to join their command at once. Colonel Belknap's command should be retained and armed. They can be turned over temporarily to Couch. When his command comes in have them armed at once.

A. V. COLBURN,

Assistant Adjutant-General.

Order Colonel Williams to send all the cavalry he has disembarked at daybreak in the morning to Tennallytown, and there await his arrival. Direct Colonel Williams to report to the general at his house and join his command from here. Direct him to leave instructions for the rest of his command to follow him as fast as they debark. He can order them to disembark at Alexandria, Washington, or Georgetown, as he may deem best.

A. V. COLBURN,

Assistant Adjutant-General.

[12.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 1, 1862.

Brigadier General S. WILLIAMS,

Headquarters Camp near Alexandria:

General McClellan directs that your order General Pleasonton to send out under an experienced officer at least a company, and better a squadron, of cavalry to Fairfax Court-House, if it is possible for them to get there. It is reported that the enemy are in that vicinity, and the cavalry should move with caution, and ascertain what troops are at Fairfax. Ours should be there.

A. V. COLBURN,

Assistant Adjutant-General.

[12.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 1, 1862.

General S. WILLIAMS,

Asst. Adjt. General, Hdqrs. Army of the Potomac, near Alexandria:

Issue orders at once to have all trains that come in to-night to park well this way from your camp, under the hill toward Fourt-Mile Creek,