CHAPTER XXI.
A New Phase to our Military Problem.—General Johnston's Position.—
Defenses of James River.—Attack on Fort Drury.—Johnston crosses
the Chickahominy.—Position of McClellan.—Position of McDowell.—
Strength of Opposing Forces.—Jackson's Expedition down the
Shenandoah Valley.—Panic at Washington and the North.—Movements
to intercept Jackson.—His Rapid Movements.—Repulses Fremont.—
Advance of Shields.—Fall of Ashby.—Port Republic, Battle of.—
Results of this Campaign.