RAPPAHANNOCK STATION, August 29, 1863. (Received 7. 45 a. m.)

General HUMPHREYS,

Chief of Staff:

The following dispatches were received from our signal officers to-day:

We intercepted the two following rebel messages to-day, Numbers 1 at 11. 55 a. m., and Numbers 2 at 5. 40 p. m.

Numbers 1.

Captain M.:

Trains are moving down the railroad. Have been for two hours. No troops yet.

B.,

Lieutenant.

Numbers 2.

Sergeant BUSH:

The trains of wagons reported this a. m. are still passing. A very large train is seen moving in the direction of Warrenton. Camps still the same.

B.,

Lieutenant.

The signal officers also report that Stuart's cavalry command is at last fully supplied with clothing.

Very respectfully,

JOHN NEWTON,

Major-General.

RAPPAHANNOCK STATION, August 29, 1863.

General HUMPHREYS,

Chief of Staff:

Lieutenant N. H. Camp, of our signal corps, took the message that Stuart was supplied with clothing.

JOHN NEWTON,

Major-General, Commanding.

FORT ETHAN ALLEN, August 29, 1863. (Received 10. 45 a. m.)

Brigadier-General DE RUSSY,

Arlington:

Lieutenant Phillips, Second Massachusetts Cavalry, from Lewinsville, reports that he is informed by parties just in from Leesburg that a large body of rebel cavalry are at that place and vicinity, and crossing over to Maryland. They went along Thornton woods last evening. Force not known.

THOS. ALLCOCK,

Lieutenant-Colonel.

HARPER'S FERRY, W. VA., August 29, 1863. (Received 2. 20 p. m.)

Major-General HALLECK,

General-in-Chief:

My guard extend to the Monocacy. Beyond that is out of this department and of my command. Any transfer of troops from my