HEADQUARTERS EIGHTH ARMY CORPS,
Baltimore, June 28, 1863.

Brigadier-General BRIGGS, Relay House:

The Sixth New York State Militia are ordered from Frederick to Baltimore. Stop them at the Relay House. The section of battery has also been ordered from the Monocacy. It travels by pike, under escort of a company of the Purnell Cavalry. Put yourself in communication with them. Use all these forces for the present for the defense of the railroads. The section of battery and company of cavalry started from the Monocacy at daylight this morning. By order:

WM. H. CHESEBROUGH,

Assistant Adjutant-General.

JUNE 28, 1863-6. 30 p. m.

Major-General SCHENCK, Baltimore:

The Sixth New York Militia left at 2 p. m. by rail, the artillery and cavalry at 5 a. m., to march to report to you. These movements were ordered before the presence of the enemy's cavalry was known on this side of the Potomac. Please report their arrival.

S. WILLIAMS,

Assistant Adjutant-General.

BALTIMORE, June 28, 1863.

Lieutenant-Colonel [GEORGE] SANGSTER,

Commanding Annapolis, Md.:

Army, organize, and send here the 500 men you spoke of; also the good arms you have. A boat will be sent to you. By order:

DONN PIATT,

Chief of Staff.

WAR DEPARTMENT, Washington,

June 28, 1863-7. 30 p. m.

Major-General SCHENCK, Baltimore, Md.:

It is probable that the rebel cavalry will first strike at the bridges near Annapolis Junction, and next at Elysville. Strengthen these points as much as you can.

H. W. HALLECK,

General-in-Chief.

THREE MILES FROM ROCKVILLE, June 28, 1863.

(Received 7. 20 p. m.)

Major ECKERT:

The wagon train is still here, burning. The rebel pickets are 2 miles from here. Citizens just in report a force of infantry and cavalry of about 8, 000 or 10, 000 in Rockwille. This pretty reliable, as