HEADQUARTERS THIRD BRIGADE, FIRST DIVISION
FORT CORCORAN, July 25, 1861

To Captain A. BAIRD, Assistant Adjutant-General, First Division
(General Tyler's).

Sir: I have the honor to submit this my report of the operations of
my brigade during the action of the 21st instant. The brigade is
composed of the Thirteenth New York Volunteers, Colonel Quinby's
Sixty-ninth New York, Colonel Corcoran; Seventy-ninth New York,
Colonel Cameron; Second Wisconsin, Lieutenant-Colonel Peck; and
Company E, Third Artillery, under command of Captain R. B. Ayres,
Fifth Artillery.

We left our camp near Centreville, pursuant to orders, at half-past
2 A. M., taking place in your column, next to the brigade of
General Schenck, and proceeded as far as the halt, before the
enemy's position, near the stone bridge across Bull Run. Here the
brigade was deployed in line along the skirt of timber to the right
of the Warrenton road, and remained quietly in position till after
10 a.m. The enemy remained very quiet, but about that time we saw
a rebel regiment leave its cover in our front, and proceed in
double-quick time on the road toward Sudley Springs, by which we
knew the columns of Colonels Hunter and Heintzelman were
approaching. About the same time we observed in motion a large
mass of the enemy, below and on the other side of the stone bridge.
I directed Captain Ayres to take position with his battery near our
right, and to open fire on this mass; but you had previously