FREDERICK, MD., July 5, 1863. (Received 9. 15 p. m.)

Major-General HALLECK:

I have just received the following information:

Five hundred wagons (rebel), guarded by about 150 infantry, 150 cavalry, three pieces of inferior-looking artillery, and from 3, 000 to 5, 000 head of cattle passed through Hagerstown last night after 11 o'clock. Could not cross the ford at Williamsport, the river being too high. Supposed to have gone to Falling Waters, having started from Williamsport in that direction this morning. The wagons were loaded with sick, wounded, and stores.

WM. H. FRENCH,

Major-General of Volunteers.

HEADQUARTERS EIGHTH ARMY CORPS, Baltimore, July 5, 1863-9. 45 p. m.

Major-General HALLECK,
General-in-Chief, Washington, D. C.:

I have not enough men now to man the fortifications at Baltimore, but I will make up a brigade of the best I have, infantry, cavalry, and a battery, perhaps 2, 500 or 3, 000 strong, and get them on the march by morning.

ROBT. C. SCHENCK,

Major-General, Commanding.

WASHINGTON, July 5, 1863-10 p. m.

Major-General HEINTZELMAN,

Commanding, Washington:

GENERAL: All cavalry detachments from the Army of the Potomac should be sent immediately to Frederick, via Rohrersville. The movement of troops ordered this afternoon should be pushed forward as rapidly as possible.

H. W. HALLECK,

General-in-Chief.

[Indorsement.]

Captain C. H. POTTER:

Order Wyndham to move as soon as possible, with every available man. Send a note to [Elias M.] Greene, and direct him to push the transportation for Elliott's people.

J. H. TAYLOR,

Assistant Adjutant-General, and Chief of Staff.

WAR DEPARTMENT, Washington, July 5, 1863-10 p. m.

Major-General SCHENCK, Baltimore, Md.:

Send everything forward to Frederick, excepting the usual garrisons of Baltimore. The enemy is in retreat, and Baltimore in no possible danger. Give General Meade all the aid in your power.

H. W. HALLECK,

General-in-Chief.