CHAMBERSBURG, PA., July 9, 1863-7 p. m.

Captain CAREY:

I visited Greencastle this a. m. Took the Williamsport pike to near Cunningham's Cross-Roads; then over to Muttontown, or Middleburg. While on the latter trip, we saw a number of wagons foraging; gave chase, and had a skirmish with some 80 infantry. We drove them, but were unable to get the wagons, as it was within 1 mile of their camp. We retraced our steps to Middleburg, and then here. While at Middleburg, I learned that Lee's headquarters were on the pike between Hagerstown and Williamsport, and a corps is camped on one side of the road this side of Hagerstown; another, near Hagerstown, and another on the Leitersburg road. One hundred men of the First New York Cavalry are here, besides my command. General Couch, I learn, is at Shippensburg; will be here to-morrow.

Received order about returning to Waynesborough. Will attend to it. Very respectfully, your obedient servant.

WM. H. BOYD.

[P. S.]-No casualty on our side.

HEADQUARTERS DEPARTMENT OF WASHINGTON, July 9, 1863-1 p. m.

Colonel LOWELL,
Commanding Cavalry, Poolesville, Md.:

The major-general commanding directs that you withdraw your cavalry and supplies from Poolesville, and report with your command at these headquarters.

Please execute this order as soon as possible. Acknowledge the receipt of this dispatch.

Respectfully,

CARROLL H. POTTER,

Assistant Adjutant-General.

HEADQUARTERS DEPARTMENT OF WASHINGTON, July 9, 1863-1 p. m.

General GEORGE G. MEADE,
Commanding Army of the Potomac, Middletown, Md.:

I have withdrawn the cavalry I had guarding the north bank of the Potomac from the mouth of the Monocacy to this place.

S. P. HEINZELMAN,

Major-General, Commanding.

WAR DEPARTMENT, Washington, July 9, 1863-4 p. m.

Major-General SCHENCK,

Baltimore, Md.:

Can you not squeeze out some more troops to send to Harper's Ferry? Try it. Baltimore and the railroads are perfectly safe.