HEADQUARTERS,
Washington, September 7, 1862-9.50 p. M.

Major General S. P. HEINTZELMAN,

Commanding Third Corps, Fort Lyon:

General McClellan has been informed that the rebels intend making a raid to-night on Alexandria. Little reliance is placed on the information, but it is, nevertheless, suggested that it may be well, as a matter of precaution, to have your pickets, &c., more than usually on the alert.

By command:

S. WILLIAMS,

Assistant Adjutant-General.

(Copy to Major General F. J. Porter, commanding Fifth Corps, Fort Corcoran, and Brigadier General John P. Slough, Alexandria.)

[19.]

HEADQUARTERS,
Washington, September 7, 1862.

Brigadier General E. B. TYLER,

Alexandria:

The headquarters of General Porter have been changed from Hall's Hill to Fort Corcoran. Report to him with your command at the latter place.

S. WILLIAMS,

Assistant Adjutant-General.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
Washington, D. C., September 7, 1862-11.55 a. M.

General W. B. FRANLIN,

Tennallytown:

The commanding general directs that you move your command toward Rockville as soon as possible. It was his intention that you should remain at Tennallytown till this morning, but not longer, and no time should be lost in getting your troops in motion.

R. B. MARCY,

Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC,
September 7, 1862-5 p. M.

Brigadier General JOHN BUFORD:

The commanding general directs that you will turn over your command to the officer next in rank to you. You will report in person to these headquarters (General Marcy, who will remain in town till to-morrow) this evening.

R. B. MARCY,

Chief of Staff.

Telegraph operator will forward this order to General Whipple, at Arlington house, who will forward it to General Buford.

[19.]