Our cavalry pickets near
Gainesville, were driven in this afternoon. Three companies of infantry,
and the right section, got ready for support. About seven o'clock P. M.,
General Stahl's division of cavalry, with three rifled guns and a
four-pound howitzer, taken from Moseby, near Fairfax Court House, two
weeks ago, passed through, going to Warrenton. A dangerous experiment was
made by John Tyng this evening. Pounding on a round shell, lying there
since the second battle of Bull Run, the shell exploded amidst a crowd of
the battery, without hurting any one.

_Monday, June 22._--Gainesville. It was read in line that General
Pleasanton, supported by Barnard's division of infantry, Fifth corps,
gained a victory over Stuart's cavalry at Upperville and Ashby Gap, taking
two guns and a quantity of small arms.

_Tuesday, June 23._--Gainesville. Trains came up from Alexandria this
morning, bringing supplies. Stahl's cavalry came back from Warrenton.

_Thursday, June 25._--Gainesville. Orders came to pack up. Two trains
arrived from Alexandria, bringing supplies, and the news that the
telegraph line had been broken and several cars burned, between this place
and Fairfax Station, by guerillas. We left Gainesville at noon, crossed
the Bull Run, marched on the Winchester and Leesburg turnpike, passed
Sudley's church, taking the same route we did under McDowell, going to and
coming from the first Bull Run battle, until we turned off to Gum Spring,
halting for the night. Marched eighteen miles in all. Battery B, lost a
caisson and two men taken prisoners, coming from Thoroughfare Gap.

_Friday, June 26._--Gum Spring. Left at ten o'clock A. M., going to
Edward's Ferry, where we arrived by eight o'clock P. M.--ten miles march.
Two pontoon bridges are drawn across the Potomac. Troops are going over
all the time. We halted for the purpose of camping. Tents were pitched,
but the order came at ten o'clock P. M., that all the troops had to cross
before daylight. General Hayes' brigade of Heintzelman's corps, consisting
of the Thirty-ninth, One Hundred and Eleventh, One Hundred and
Twenty-fifth, and One Hundred and Twenty-sixth New York regiments, was
attached to the Second corps.

_Saturday, June 27._--Crossed the Potomac at two o'clock in the morning.
Went to rest a mile from the river. Remained until two o'clock P. M.
Resumed marching. Passed through Poolesville at four, Barnesville at nine,
and went to camp at the foot of Sugar Loaf