FORT CORCORAN, August 24, 1864.

(Received 9.15 a.m.)

Lieutenant Colonel J. H. TAYLOR:

An orderly just arrived with dispatches from cavalry camp near Falls Church, Va., informing me that the post at Annandale has been attacked by a large force of the enemy, having artillery. One hundred and seventy of the cavalry battalion is in stockade at Annandale. This dispatch is signed by Colonel H. M. Lazelle, through his adjutant, Lieutenant Lansing, acting assistant adjutant-general. Can you send me troops?

G. A. DE RUSSY,

Brigadier-General of Volunteers.

HDQRS. DEPARTMENT OF WASHINGTON, 22ND ARMY CORPS,
Washington, D. C., August 24, 1864.

Brigadier-General DE RUSSY,

Fort Corcoran:

GENERAL: The force can only be Mosby's. Further information will be forwarded when received.

Respectfully,

J. H. TAYLOR,

Chief of Staff and Assistant Adjutant-General.

HDQRS. DEPARTMENT OF WASHINGTON, 22ND ARMY CORPS,
Washington, D. C., August 24, 1864.

Brigadier-General DE RUSSY,

Commanding Division:

GENERAL: The attacking force at Annandale was simply a detachment of Mosby's people, and has been driven off.

Respectfully,

J. H. TAYLOR,

Chief of Staff and Assistant Adjutant-General.

HEADQUARTERS CAVALRY BRIGADE,
Near Fort Buffalo, Va., August 24, 1864-6 a.m.

Lieutenant Colonel J. H. TAYLOR,

Chief of Staff and Assistant Adjutant-General:

COLONEL: I have the honor to inform you that an orderly has just arrived from a picket-post this side of Annandale bringing information that the stockade at Annandale is being attacked; in what force is not known, but have artillery. The shots can be heard distinctly from here. One of the men said that he saw two pieces of artillery and about fifty men.

Very respectfully, your obedient servant,

H. M. LAZELLE,

Colonel Sixteenth New York Cavalry, Comdg. Cavalry Brigade.