PITTSBURGH, PA., August 9, 1863.

(Received 4 p. m.)

Major-General HALLECK:

Six companies six-months' cavalry can be sent at once. There are four regiments of three-months' militia here, and I have sent to inquire as to their willingness, but shall not hesitate to order them if they are needed. Some militia can be raised near Wheeling.

W. T. H. BROOKS,

Major-General.

RAPPAHANNOCK, August 9, 1863

(Received between 2. 30 and 3. 30 p. m.)

General HUMPHREYS:

The following intercepted dispatch just received;

General LEE:

Yankee camps diminished about Warrenton and Waterloo; now appear on the railroad.

STUART,

General.

JOHN NEWTON,

Major-General.

CENTREVILLE,

August 9, 1863

Major LA MOTTE,

Commanding Fairfax Station:

It is not impossible that Stuart may attempt such a raid in order to break up the railroad. Every precaution must be taken to guard against this, and the utmost vigilance exercised. The country south of the road in the vicinity of Accotink and Burke's Station should be constantly and thoroughly scouted. If you can find any trust-worthy men, residents or others, familiar with the country, you are authorized to employ them for this purpose, in addition to your own troops.

RUFUS KING,

Brigadier-General, Commanding.

MARTINSBURG,

August 9, 1863

Colonel McREYNOLDS

Eutaw House:

Telegram received from Harper's Ferry. General Lockwood absent. His aide-de-camp says their cavalry were cut to pieces and scattered. Major Quinn is at Point of Rocks. He saw nothing of the enemy. The aide-de-camp wishes Quinn to remain until General lutely necessary below. Let me know your address in Washington.

WILDES,

Lieutenant-Colonel, Commanding.