HDQRS. DEPT. OF WASHINGTON, 22nd ARMY CORPS, Washington, D. C., May 13, 1864.

General TYLER,
Commanding, Fairfax Court-House:

Send at once the Rhode Island cavalry and the battalion of Veteran Reserve Corps to Alexandria, to report to me from there the moment they arrive. The Second District of Columbia and the Fourth Delaware will be placed on the Orange and Alexandria Railroad, between Bull Run and Springfield Station, to report to General Slough. Colonel Lowell, with one of his cavalry regiments and the battalion of Pennsylvania infantry, will take post at Fairfax Court-House, the colonel to report direct to these headquarters. After making these changes report in person here with your aides-de-camp and assistant adjutant-general. Apply to Alexandria for trains. Do not interfere with arrangements for the Irish Legion.

C. C. AUGUR,

Major-General, U. S. Volunteers.

HDQRS. DEPT. OF WASHINGTON, 22nd ARMY CORPS, Washington, D. C., May 13, 1864.

Brigadier General R. O. TYLER,
Commanding, Fairfax Court-House:

GENERAL: Let the Seventeenth New York Battery remain at Fairfax Court-House and report to Colonel Lowell. Send the Irish Legion to Alexandria, reporting their departure by telegram. The colonel commanding will, on reaching Alexandria, place his command in Soldiers' Rest and report by telegram to these headquarters.

Very respectfully,

J. H. TAYLOR,

Chief of Staff and Assistant Adjutant-General.

NEAR WOODSTOCK, VA., May 13, 1864-5 p.m .(Received 12 m. 14th.)

ADJUTANT-GENERAL U. S. ARMY:

The following dispatches were found with many others in telegraph papers by Mr. McCaine, cipher operator at Woodstock, after we enter the town. It shows that Breckinridge is at Staunton, and has sent 4,000 men there. Captain Davis now commands Gilmor's battalion, and is in our front:

LA FAYETTE STATION, May 5, 1864-4 p. m.

Brigadier-General IMBODEN:

Cant's make out your dispatch in cipher of this date. I have 4,000 men en route for Jackson River Depot to take cars. I --. (Here the dispatch stops.)

STAUNTON, May 10, 1864.

Captain DAVIS:

Try and find out real force of enemy, and proportion of infantry, artillery, and cavalry. There is a report of a column of cavalry at Madison Court-House, moving toward Charlottesville. Can this be part of Sigel's force? I want to know at earliest moment any movement toward Grant. Communicate often with me.

BRECKINRIDGE.

My principal object in advancing up the Shenandoah Valley was to threaten Stauton, to divide the forces of Breckinridge, and to assist by these means General Crook, whose object is to destroy New