HAGERSTOWN, October 10, 1862.

R. B. MARCY, Chief of Staff:

Citizens report that a force of the enemy crossed the river before daylight, this morning, at Kinsell's Ferry, in front of Clear Spring, and captured 4 of our men, on picket there. It is supposed they are after a woolen factory there. General Kenly reports: " I have very reliable information that the enemy commenced crossing the river about daylight, this morning, 8 miles above here, at McCoy's Ferry. I shall send some of Davis' regiment to communicate with General Cox, who was at Clear Spring last night, and to go on to Kinsell's Ferry."

W. T. H. BROOKS,

Brigadier-General.

HAGERSTOWN, MD., October 10, 1862

Brigadier-General MARCY,

Chief of Staff, Hdqrs. Army of the Potomac:

General Kenly writes, at 11 a. m.: "The enemy have shown themselves in strong opposite my post. They have crossed above as I advised you previously."

W. T. H. BROOKS,

Brigadier-General.

HAGERSTOWN, MD., October 10. 1862

General R. B. MARCY, Chief of Staff:

General Kenly reports, at 12 m.: " The enemy have crossed the National pike toward Mercersburg and Little Cove, Pa. They are about 2,500 strong-cavalry and artillery."

Little Cove is a rich valley in Bedford County, about 9 miles from Mercersburg.

W. T. H. BROOKS

Brigadier-General

HEADQUARTERS ARMY OF THE POTOMAC,
October 10, 1862-4 p. m. (Received 5 p. m.)

General W. T. H. BROOKS,

Commanding, Hagerstown:

The commanding general directs that you send out a messenger at once to General Crook, commanding Cox's division, and inform him that he is to endeavor to intercept the rebel troops that are said to have crossed the Potomac this morning. He will discontinue his march to Clarksburg, of this purpose, and report everything of importance that occurs, to these headquarters. Please report the best information you have of the enemy, directed to Knoxville and to headquarters ear Harper's Ferry.

R. B. MARCY,

Chief of Staff.

Commanding Cavalry: