of the march. No horses will be abandoned or destroyed to-morrow. General Devin will detach a strong rear guard to bring up all stragglers and horses from on the road. This rear guard will be ordered to halt some distance on this side the White House and will picket the roads leading into that place.

By command of Brevet Major-General Merritt:

J. SPREADBURY,

Acting Assistant Adjutant-General.

ALEXANDRIA, March 17, 1865.

Colonel TAYLOR:

COLONEL: We have information that about 170 rebel cavalry intend making a raid into Fairfax County to-night. They will come from Prince William County. I have telegraphed this to Colonel Gamble, and have sent what men I have out.

H. H. WELLIS,

Colonel and Pro. March General, Defenses South of the Potomac.

HEADQUARTERS SEPARATE BRIGADE,
Fairfax Court-House, Va., March 17, 1865-5.30 p. m.

Colonel WELLS,

Provost-Marshal-General, Alexandria:

COLONEL: Your telegram received. The line notified. We are ready for a free fight.

W. GAMBLE,

Colonel, Commanding Brigade.

HEADQUARTERS DEPARTMENT OF WASHINGTON,
TWENTY-SECOND ARMY CORPS,

Washington, D. C., March 17, 1865-10.05 a. m.

General GAMBLE,

Commanding Fairfax Court-House:

How soon can you spare about 800 cavalry, in good condition, to make an expedition to the Northern Neck?

C. C. AUGUR,

Major-General.

FAIRFAX COURTS-HOUSE, VA.,

March 17, 1865-10.30 p. m. (Received 11.30 p. m.)

Major General C. C. AUGUR:

GENERAL: I can have 800 cavalry ready to start Monday morning for the Northern Neck. The Eight Illinois Cavalry are now drawing horses and arms. Colonel Clendenin will call on you to-morrow forenoon.

W. GAMBLE,

Colonel, Commanding Brigade.