SIGNAL STATION,

Washington, D. C., July 11, 1864.

(Received 6. 45 p. m.)

Colonel TAYLOR, Chief of Staff:

My dismounted cavalry are mostly out of ammunition. I wish you would send me some of all calibers.

McCOOK,

Major-General.

HDQRS. DEPT. OF WASHINGTON, 22nd ARMY CORPS,
Washington, D. C., July 11, 1864-11. 40 p. m.

Major-General McCOOK,

Commanding Reserve, Fort Stevens:

GENERAL: The following dispatch is just received from Brigadier-General Hardin:

[10. 55 P. M.]

The chief officer of pickets says the enemy are apparently making every preparation for a grand assault, tearing down fences, bands playing. Cavalry is moving to our left. Cannot a part of the Sixth Corps be hurried up at once?

The Sixth Corps is all ordered to the vicinity of Fort Stevens. You will furnish General Hardin such assistance as he requires.

Acknowledge the receipt of this.

C. A. RAYMOND,

Assistant Adjutant-General.,

FORT RENO, July 11, 1864.

(Received 9 a. m.)

Major General C. C. AUGUR:

LEESBOROUGH, MD., July 11, 1864-6 a. m.

Colonel C. R. LOWELL, Jr.:

I have just arrived here and find the First New Jersey Cavalry just leaving for Brookeville. The rumor is the enemy are in Rockville, six miles distant. I am letting my men breakfast.

Very respectfully, &c.,

H. H. CROCKER,

Lieutenant, Second Massachusetts Cavalry.

GENERAL: I send this, which I have received. The force in my immediate front on the Rockville road is about six squadrons, not more, and one, or perhaps two, guns. I am now near the old Stone Tavern. Firing has been twice reported as heard on the left toward the River road. I have not myself heard it. I have a good position to remain in if you wish it, or do you prefer to have them brought nearer?

Your obedient servant,

C. R. LOWELL, Jr.,

Colonel, &c.

M. D. HARDIN,

Brigadier-General.

HEADQUARTERS HARDIN'S DIVISION,

Fort Reno, July 11, 1864-9. 20 [a. m.]

(Received 9. 25.)

General AUGUR:

The enemy has a rifle gun on right of the Rockville road. They fire a short about every fifteen minutes at the picket-line. I would