HEADQUARTERS DEFENSES OF WASHINGTON,
March 21, 1863.

Commanding Officers, Poolesville and Union Mills:

The following information is just received from Harper-s Ferry:

General HEINTZELMAN:

I have received reliable information that Stuart's cavalry is moving int he direction of Loudoun Country, 3 miles from Fish Gap.

R. S. ROBERTS,

Brigadier-General.

The general commanding desires that attention be given to this information, and that your commands be on the alert. It is possible that Fish Gap means some other point. You will report any information you have.

S. H. LATHROP,

Lieutenant-Colonel and Assistant Inspector-General.

POOLESVILLE, [MD.,]

March 22, 1863-4 p. m.

Lieutenant-Colonel LATHROP,

Assistant Adjutant-General, Department of Washington:

COLONEL: Your dispatch in relation to movements of Stuart's cavalry is received, and measures taken to carry out the general's wishes. The men will not be caught napping. I have been along the bank of the river this p. m., and could discover no signs of an enemy. The river is high and unfordable. We shall be able to give him a warm reception if he attempts to cross within our lines.

With high respect, your obedient servant,

A. B. JEWETT,

Colonel, Commanding Brigade.

HARPER'S FERRY, VA.,

March 23, 1863-9.30 p. m.

Major-General HEINTZELMAN,

Commanding Defenses of Washington:

Colonel Schley has just this moment telegraphed me that Stuart, with his cavalry, is this side of Leesburg, in the direction of Nolan's Ferry.

B. S. ROBERTS,

Brigadier-General, Commanding.

CAMP NEAR FALMOUTH, VA.,

March 23, 1863.

Colonel J. C. KELTON,

Assistant Adjutant-General:

In view of the fact that when this army moves the sudden stoppage of all visitors to this camp would be a preliminary notice thereof; also