BALTIMORE, MD., June 15, 1863.

(Copy received, War Department, 11. 30 a. m.)

General TYLER,

Harper's Ferry:

At noon a special train will start, taking an officer and 10 men of the [First] Connecticut Cavalry, with their horses, to Monocacy Bridge; thence they will start as scouts, to see if enemy is coming around in your rear, or is or has been about Hagerstown, and will report to me telegraph from Frederick as soon as they can. Cannot you get, by scouts, definite information of the enemy in front of you?

ROBT. C. SCHENCK,

Major-General.

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BALTIMORE, June 16, 1863-1 p. m.

Major-General MILROY,

Harper's Ferry, W. Va.:

The following has just been received from Cumberland telegraph operator: Colonel [J. A.] Galligher and Lieutenant-Colonel [J. L.] Moss, with parts of their regiments and portions of First New York and First and Third West Virginia Cavalry, and 300 team horses, escaped from Winchester yesterday morning, arrived safely at Sir John's Run, and crossed into Maryland. Were to take National road, and come here. Not arrived yet.

ROBT. C. SCHENCK,

Major-General, Commanding.

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WAR DEPARTMENT, Washington,

June 16, 1863-1. 30 p. m.

Major-General SCHENCK,

Baltimore, Md.:

My orders to concentrate your forces at certain points do not mean that you abandon block-houses established for the security of railroad bridges. These block- houses were built for the very object of saving these bridges from raids as far as possible. All other troops, excepting the small forces in block-houses, must be immediately concentrated as ordered.

H. W. HALLECK,

General-in-Chief.

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BALTIMORE, June 16, 1863.

Brigadier-General TYLER,

Harper's Ferry.

Do you want more subsistence? Have you enough for twenty days? If not, the train must go on. If so, the train must return. It will not do to have it exposed on road. We are embarrassed by not receiving prompt answers.

By order:

DONN PIATT,

Chief of Staff.