tunity of acquiring that endurance and hardiness and discipline
which frequent movement of troops confers. Hence, all unused to the
discipline of the march, every moment some one falls out of line to
"pick blackberries, or to get water." Says McDowell, in afterward
reporting this march: "They would not keep in the ranks, order as much
as you pleased. When they came where water was fresh, they would pour
the old water out of their canteens and fill them with fresh water; they
were not used to denying themselves much."

Meantime, Heintzelman's Division is also advancing, by cross-roads, more
to the left and South of the railroad line,--in accordance with
McDowell's plan, which comprehends not only the bagging of Bonham, but
an immediate subsequent demonstration, by Tyler, upon Centreville and
beyond, while Heintzelman, supported by Hunter and Miles, shall swoop
across Bull Run, at Wolf Run Shoals, some distance below Union Mills,
turn the Enemy's right, and cut off his Southern line of railroad
communications. Thus, by the evening of Wednesday, the 17th,
Heintzelman is at Sangster's Station, while Tyler, Miles, and Hunter,
are at Fairfax.

It is a rather rough experience that now befalls the Grand Army of the
Union. All unused, as we have seen, to the fatigues and other hardships
of the march, the raw levies, of which it almost wholly consists, which
started bright and fresh, strong and hopeful, full of the buoyant ardor
of enthusiastic patriotism, on that hot July afternoon, only some thirty
hours back, are now dust-begrimed, footsore, broken down, exhausted by
the scorching sun, hungry, and without food,--for they have wasted the
rations with which they started, and the supply-trains have not yet
arrived. Thus, hungry and physically prostrated, "utterly played out,"
as many of them confess, and demoralized also by straggling and loss of
organization, they bivouac that night in the woods, and dream uneasy
dreams beneath the comfortless stars.

A mile beyond Fairfax Court House, on the Warrenton Turnpike, is
Germantown. It is here that Tyler's Division has rested, on the night
of the 17th. At 7 o'clock on the morning of Thursday, the 18th, in
obedience to written orders from McDowell, it presses forward, on that
"Pike," to Centreville, five miles nearer to the Enemy's position behind
Bull Run--Richardson's Brigade in advance--and, at 9 o'clock, occupies
it. Here McDowell has intended Tyler to remain, in accorda