June 22, 1863-9. 45 a. m.

Major-General HEINTZELMAN:

Major-General Stahel was directed by me to make a reconnaissance with his disposable cavalry in the direction of Warrenton, where I had reason to believe the enemy held a brigade of cavalry. Up to this hour I have received no advises from him. Unless he should fall in with the enemy, I shall look for his return to-night.

HOOKER,

Major-General.

HEADQUARTERS ARMY OF THE POTOMAC,
June 22, 1863-11. 57 a. m.

General ABERCROMBIE; General SLOCUM, Leesburg; General HOWE,

Bristoe; General CRAWFORD, Upton's Hill;

General FRENCH, Gainesville;

General TYLER, Sandy Hook,

General REYNOLDS (by signal); Captain McKEE, Monocacy; Captain TURNBULL, Edward Ferry:

General Pleasonton reports he attacked the enemy's cavalry, under Stuart, yesterday. He was assisted by Barnes' division of the Fifth Corps. Drove him steadily all day through Upperville into Ashby's Gap, and inflicted heavy loss upon him at every step; captured a large number of small-arms, sabers, &c. ; two pieces of artillery (one a Blakely gun), three caissons, and exploded one. A number of prisoners and a large number of wounded left in Upperville. Enemy left dead and wounded on the field. Our loss small. A disastrous day to the rebel cavalry. Many charges made, and the saber used freely, with great advantage to us. Please inform the commanders in your vicinity of the above, and let it be made known to the troops.

DANL. BUTTERFIELD,

Major-General, Chief of Staff.

(Same to Howard.)

Baltimore, MD., June 22, 1863.

(Copy received, War Department, 12. 50 a. m.)

Colonel G. H. SHARPE, Provost-Marshal-General, Hdqrs. Army of the Potomac:

Rebels in Hagerstown 3, 000 strong on Saturday evening; no indications of coming to Baltimore. Came into Frederick Sunday morning at 10 o'clock in force, mounted men; others seen advancing in the direction of South Mountain. They intend to hold the place. Boonsborough has been or is being fortified by them. All the above from reliable sources.

WESTMINSTER, CARROLL COUNTY, MD., Monday Morning-5 o'clock. No rebels. This from one of my force. No news from our friend

J. L. McPHALL.