n that purpose be, but to throw his augmented right upon our left, at
Blackburn's Ford, and so, along the ridge-road, upon Centreville? Thus
McDowell guesses, and guesses well. To be in readiness to protect his
own left and rear, by reenforcing Miles's Division, at Centreville and
along the ridge to Blackburn's Ford, he temporarily holds back Howard's
Brigade of Heintzelman's Division at the point where the cross-road to
Sudley Springs Ford-along which Hunter's Division, followed by the
Brigades of Franklin and Wilcox, of Heintzelman's Division, have already
gone-intersects the Warrenton Pike.

It is 9 o'clock. Beauregard, as yet unaware of McDowell's new plan,
sends an order to Ewell, on his right, to hold himself ready "to take
the offensive, at a moment's notice,"--and directing that Ewell be
supported in his advance, toward Sangster's cross-roads and the rear of
Centreville, by Holmes's Brigade. In accordance with that order, Ewell,
who is "at Union Mills and its neighborhood," gets his brigade ready,
and Holmes moves up to his support. After waiting two hours, Ewell
receives another order, for both Ewell and Holmes "to resume their
places." Something must have occurred since 9 o'clock, to defeat
Beauregard's plan of attack on Centreville--with all its glorious
consequences! What can it be? We shall see.

While Tyler's Artillery has been cannonading the Rebel left, under
Evans, at Stone Bridge,--fully impressed with the prevailing Union
belief that the bridge is not only protected by strong masked batteries,
heavy supports of Infantry, and by abatis as well as other defenses, but
is also mined and ready to be blown up at the approach of our troops,
when in reality the bridge is not mined, and the Rebel force in men and
guns at that point has been greatly weakened in anticipation of
Beauregard's projected advance upon Centreville,--the Union column,
under Hunter and Heintzelman, is advancing from Centreville, in the
scorching heat and suffocating dust of this tropical July morning,
slowly, but surely, along the Warrenton Pike and the cross-road to
Sudley Springs Ford--a distance of some eight miles of weary and
toilsome marching for raw troops in such a temperature--in this order:
Burnside's Brigade, followed by Andrew Porter's Brigade,--both of
Hunter's Division; then Franklin's Brigade, followed by Willcox's
Brigade,--both of Heintzelman's Division.

It is half past 9 o'clock; before Burnside's Brigade ha