ense, at the same time illustrating scientifically and forcibly
the peculiar disadvantages under which the Union army had hitherto
labored.

The section that received my closest attention has its northern limit
along the Potomac between McCoy's ferry at the eastern base of the
North Mountain, and Harper's Ferry at the western base of the Blue
Ridge. The southern limit is south of Staunton, on the divide which
separates the waters flowing into the Potomac from those that run to
the James. The western boundary is the eastern slope of the
Alleghany Mountains, the eastern, the Blue Ridge; these two distinct
mountain ranges trending about southwest inclose a stretch of quite
open, undulating country varying in width from the northern to the
southern extremity, and dotted at frequent intervals with patches of
heavy woods: At Martinsburg the valley is about sixty miles broad,
and on an east and west line drawn through Winchester about
forty-five, while at Strasburg it narrows down to about twenty-five.
Just southeast of Strasburg, which is nearly midway between the
eastern and western walls of the valley, rises an abrupt range of
mountains called Massanutten, consisting of several ridges which
extend southward between the North and South Forks of the Shenandoah
River until, losing their identity, they merge into lower but broken
ground between New Market and Harrisonburg. The Massanutten ranges,
with their spurs and hills, divide the Shenandoah Valley into two
valleys, the one next the Blue Ridge being called the Luray, while
that next the North Mountain retains the name of Shenandoah.

A broad macadamized road, leading south from Williamsport, Maryland,
to Lexington, Virginia, was built at an early day to connect the
interior of the latter State with the Chesapeake and Ohio canal, and
along this road are situated the principal towns and villages of the
Shenandoah Valley, with lateral lines of communication extending to
the mountain ranges on the east and west. The roads running toward
the Blue Ridge are nearly all macadamized, and the principal ones
lead to the railroad system of eastern Virginia through Snicker's,
Ashby's Manassas, Chester, Thornton's Swift Run, Brown's and
Rock-fish gaps, tending to an ultimate centre at Richmond. These gaps
are low and easy, offering little obstruction to the march of an army
coming from eastern Virginia, and thus the Union troops operating west
of the Blue Ridge were always subject