HEADQUARTERS Cavalry Corps,
June 17, 1863-3 a. m.

Brigadier-General GREGG,

Commanding Second Division:

GENERAL: The general commanding directs that you have your command ready to move at 5 o'clock this a. m., to march all encamp at Aldie to-night. One regiment of your command will be sent through Thoroughfare Gap as far as Middleburg to-night, scouting the country well in that vicinity. These headquarters will be at Aldie to-night. The officer going to Middleburg will report anything that occurs. Your train will fill up with supplies before starting, and you will please report in person to the commander before marching.

Very respectfully, your obedient servant,

A. J. ALEXANDER,

Assistant Adjutant-General.

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HEADQUARTERS ARMY OF THE POTOMAC,
June 17, 1863-5 a. m.

GENERAL TYLER,

Reserve Artillery, Fairfax Court-House:

Order for your march revoked. Remain, and do not follow Slocum. Answer.

DANL. BUTTERFIELD,

Major-General, Chief of Staff.

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HEADQUARTERS ARMY OF THE POTOMAC, Fairfax Station, Va.,
June 17, 1863-7 a. m.

Commanding Officer Second Corps:

Order for march to-day are so far countermanded as to have your corps encamp in the vicinity of Sangster's Station to-night. Sixth Corps at Fairfax Station, Twelfth Corps at Dranesville, Eleventh Corps at Guilford Station, First Corps at Goose Creek, Fifth Corps at Gum Springs, Third Corps at Centreville; headquarters near Fairfax Station. Please send in an orderly for orders this p. m.

Very respectfully, &c.,

DANL. BUTTERFIELD,

Major-General, Chief of Staff.

(Similar letters sent to commanding officers of the First, Third.

Fifth, Sixth, Eleventh, and Twelfth Corps.)

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HEADQUARTERS ARMY OF THE POTOMAC,
June 17, 1863.

Brigadier-General PLEASONTON,

Commanding Cavalry:

GENERAL: Since you were here last night, the character of the telegraphic information received would indicate that not as much has been seen of the enemy in Maryland as we supposed. This, like all