forward as you safely can toward Chester Gap, and the road thence to Colpeper Court-House, and inform him how much more cavalry is necessary to c arry out his purposes, bearing in mind what he told you to-day. Please report as early as possible what Averell's losses have been.

A. V. COLBURN,

Assistant Adjutant-General.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
November 4, 1862-8.45 p. m.

Brigadier General GEORGE D. BAYARD,

Commanding Cavalry Brigade:

GENERAL: The commanding general directs you to detach one of your weakest regiments to scout to-morrow and next day between Upperville and Berlin, and to protect our wagon trains from straggling parties of the enemy's cavalry, should such parties make their appearance in the neighborhood of the roads between the two places mentioned.

I am, general, very respectfully, your obedient servant,

GEO. D. RUGGLES,

Colonel and Assistant Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
November 4, 1862.

Brigadier General G. D. BAYARD,

Commanding Cavalry Brigade:

The commanding general directs me to inform you that General Burnside's command will move early in the morning, and take the line between Piedmont and Salem. Reynodls will take position on the left and rear of Burnside, extending from Rectortown to White Plains. Franklin will take position on the Aldie pike e ast of Upperville. Porter and couch will remain where they are to-morrow. Headquartes will be on the road from Millville to Rectortown, near Rectortown. You will please move with your brigade at daylight to Salem, and take a position in front of it, so as to be in readiness to support Pleasonton or to move on Warrenton. Plese leave a staff officer at headquarters to communicate orders to you. It is important that you start a the time ordered.

A. V. COLBURN,

Assistant Adjutant-General.

[19.]

HEADQUARTERS FOURTH ARMY CORPS,
Yorktown, Va., November 4, 1 862.

Major-General DIX,

Commanding Seventh Military Department:

SIR: It was reported on the night of the 28th ultimo that a force of rebel cavalry was coming down on a raid to Williamsburg. It was afterward ascertained that such was the fact, and 800 finely mounted rebel cavalry, under Colonel Shingler, approahced to within ashort distance of the town. The Fifth Pennsylvania Cavalry were, however, on the alert. They captured a rebel picket five miles out and made such dispositions that no attack was made. On Sunday last (2nd instant) the Fifth captured a lieutenant of the Fifteenth Virginia Cavalry, killed his companion, and captured both their horses, some fourteen miles