bridge at the Monocacy you can obtain such subsistence stores as you may require.

Respectfully, your obedient servant,

R. B. MARCY,

Chief of Staff.

P. S. - Your wagons will follow in rear of all the troops and ambulances.

R. B. M.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC.

Camp near Frederick, September 13, 1862-5.45 p. M.

Captain W. P. SANDERS,
Commanding Sxith Cavalry;

The general commanding directs that you send at once one company of cavalry to Noland's Ferry to assist the force to be left there by General Couch in guarding that point. You will then push forawrd with your command to Jefferson. From this point you will throw out scouts as far as possible towrad Harper's Ferry. You will also open communication with General Pleasonton, who will be found on the National road between Middletown and the South Mountain or Blue Ridge.

Very respectfully, yours,

R. B. MARCY,

Chief of Staff.

P. S. - Use your judgment whether to reach Jefferson via Point of Rocks or Adamstown. If the latter, leave a strong party at Point of Rocks until you have covered it west of the Catoctin.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC.

September 13, 1862-7.30 a. M.

COMMANDING OFFICER FIRST RHODE ISLAND CAVALRY:

The commanding general directs you to move at once with your regiment to Seneca and Poolesville to watch all the foreds from Seneca to the mouth of the Monocacy.

Respectfully,
R. B. MARCY,

Chief of Staff.

[19.]

SPECIAL ORDERS,
HDQRS. DEFENSES OF WASHINGTON. No. 4.
Washington, September 13, 1862.

1. In compliance with instructions from the General-in-Chief, Brigadier-General Stoneman will report to Major-General Heintzelman, commanding defenses south of Potomac, for the command of Kearny's division, Fifth Corps.

2. Paragraph 3, of Special Orders, Numbers 3. of yesterday's date, from these headquarters is revoked. Brigadier General J. G. Barnard is assigned to duty as chief engineer of the defenses of Washington to date from the 3rd instant.

By command of Major-General Banks:

RICHD. B. IRWIN.

Captain, Aide-de-Camp, and Acting Assistant Adjutant-General.

[19.]