Citizens now passing here. Postmaster from Rockville in; says rebels advancing toward Rockville, four miles out. Mail captured on road to Frederick, fifteen miles above Rockville. Reports it Longstreet's corps.

MARBLE,

Colonel.

I send you paper just received from a quartermaster.

[Indorsement.]

AUGUST 2, 1864--12. 30 a. m.

The within just received. It is simply a more detailed statement of the report first received.

C. C. AUGUR,

Major-General.

HDQRS. HARDIN'S DIVISION, 22nd ARMY CORPS,
DEPARTMENT OF WASHINGTON,

Washington, D. C., August 1, 1864.

Colonel MARBLE,

First Brigade:

The Second District of Columbia Volunteers has been ordered to Tennallytown and on the Rockville pike. Give Colonel Alexander any information you may possess, and keep your command in shape to repel an attack if one is made. Have your pickets strengthened and vigilant on all the roads.

Very respectfully,

R. CHANDLER,

Assistant Adjutant-General.

HDQRS. HARDIN'S DIVISION, 22nd ARMY CORPS,
DEPARTMENT OF WASHINGTON,

Washington, D. C., August 1, 1864--10. 30 p. m.

Colonel ALEXANDER,

Second District of Columbia Volunteers:

The general commanding directs that you move at once with your regiment to Tennallytown, and remain during the night to repel any cavalry which may attempt to approach. Post your men on the Rockville pike and vicinity, and throw out pickets to the front. Colonel Marble will give you any information about the roads which you do not possess. It will be necessary for your regiment to move as soon as possible, as cavalry is reported approaching.

Very respectfully,

R. CHANDLER,

Assistant Adjutant-General.

HDQRS. HARDIN'S DIVISION, 22nd ARMY CORPS,
DEPARTMENT OF WASHINGTON,

Washington, D. C., August 1, 1864--11 p. m.

Colonel HAYWARD,

Second Brigade:

It is reported that rebel cavalry is approaching on the Rockville road. The general commanding directs that you strengthen your