the as rapidly as possible, without fatiguing the men, to Urbana. If you have not left Washington the general wishes you [to] march directly to Rockville by the Georgetown turnpike.

By command of Major-General Porter:

ALEX. S. WEBB,

Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC.

Frederick, September 13, 1862-3 p. M.

Brigadier-General PLEASONTON:

GENERAL: The following order of march of the enemy is dated September 9.* General McClellan desires you to ascertain whether this order of march has thus far been followed by the enemy. As the pass through the Blue Ridge may be disputed by two columns, he desires you to approach it with great caution.

I am, general, very respectfully, your obedient servant,
R. B. MARCY,

Chief of Staff.

P. S. - Ascertain if there is any truth in the report of Captain Sanders to you yesterday that the enemy has a force of 30,000 at Burkittsville.

R. B. MARCY,

Chief of Staff.

[19.]

HEADQUARTERS ARMY OF THE POTOMAC.

Frederick, September 13, 1862-9 p. M.

Brigadier-General PLEASONTON:

GENERAL: The commanding general directs you to fire occasionally a few artillery shots (even though no enemy be in your front to fire at), so as to let Colonel Miles at Harper's Ferry know that our troops are near him. Subsistence stores have been received by rail. Upon sending your disposable wagons to the train on the other side of the railroad

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*For order (here omitted) see paragraph III to X, inclusive, VOL. XIX, Part II, pp. 603, 604.

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