HARPER'S FERRY, W. VA.,

March 31, 1864-11 a. m. (Received 2. 35 p. m.)

Major General C. C. AUGUR,

Washington:

I have taken prisoner a man trying to reach the rebel army. He confesses that a party to which he belongs will try and cross the Potomac near the mouth of Monocacy or below. They will leave Baltimore. I have notified General Wallace to arrest the parties if possible, sending him the names.

J. C. SULLIVAN,

Brigadier-General.

CUMBERLAND, MD., March 31, 1864.

Lieutenant General U. S. GRANT,

Headquarters Army in the Field:

Major-General Ord has arrived. I will sent report by messenger.

F. SIGEL,

Major-General.

HARPER'S FERRY, March 31, 1864.

Captain WILL RUMSEY,

Assistant Adjutant-General:

The condition of the roads are such that I deem it advisable to put the Halltown railroad in repair. I have nearly enough iron and ties; only want men to lay it. Would it be consistent for you to order Colonel Taylor to detail 150 dismounted men to assist?

R. S. GARDNER,

Captain, Assistant Quartermaster.

ITINERARY OF THE ARMY OF THE POTOMAC. *

CAVALRY CORPS. +

First Division, commanded by Brigadier General Wesley Merritt.

During the month the division was encamped in the vicinity of Culpeper Court-House, engaged in picketing from below Raccoon Ford, on the Rapidan River, to the vicinity of Hazel River.

Second Brigade, First Division, commanded by Colonel Thomas C. Devin, Sixth New York Cavalry.

March 1 to 31. --Picketed from Stoen House Mountain, 5 miles in front of Culpeper, on the right, to the James City road, on the left, 8 miles.

March 15. --A detachment of 400 men of this brigade, under Major William P. Hall, Sixth New York cavalry, returned from an expe-

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*From returns of the commands indicated for March, 1864.

+Commanded by Major General Alfred Pleasonton to March 25; then (temporarily) by Brigadier General David McM. Gregg.

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