This "Warrenton Pike"--as it is termed--also plays a somewhat
conspicuous part, before, during, and after the Battle of Bull Run. For
most of its length, from Fairfax Court-House to Warrenton, the Warrenton
Pike pursues a course almost parallel with the Orange and Alexandria
railroad aforesaid, while the stream of Bull Run, pursuing a
South-easterly course, has a general direction almost parallel with
that of the Manassas Gap railroad.

We shall find that it is the diamond-shaped parallelogram, formed by the
obtuse angle junction of the two railroads on the South, and the
similarly obtuse-angled crossing of the stream of Bull Run by the
Warrenton Pike on the North, that is destined to become the historic
battle-field of the first "Bull Run," or "Manassas;" and it is in the
Northern obtuse-angle of this parallelogram that the main fighting is
done, upon a spot not much more than one mile square, three sides of the
same being bounded respectively by the Bull Run stream, the Warrenton
Pike, which crosses it on a stone bridge, and the Sudley Springs road,
which crosses the Pike, at right-angles to it, near a stone house.

On the 3rd of June, 1861, General McDowell, in command of the Department
of North-Eastern Virginia, with head-quarters at Arlington, near
Washington, receives from Colonel Townsend, Assistant Adjutant-General
with Lieutenant-General Scott--who is in Chief command of all the Union
Forces, with Headquarters at Washington--a brief but pregnant
communication, the body of which runs thus: "General Scott desires you
to submit an estimate of the number and composition of a column to be
pushed toward Manassas Junction, and perhaps the Gap, say in four or
five days, to favor Patterson's attack on Harper's Ferry. The rumor is
that Arlington Heights will be attacked to-night."