of four Infantry regiments, with two 6-pounders.

At McLean's Ford, Brigadier-General D. R. Jones's Third Brigade of three
Infantry regiments, one Cavalry company, and two 6-pounders.

At Union Mills Ford, Brigadier-General R. S. Ewell's Second Brigade, of
three Infantry regiments, three Cavalry companies, and four 12-powder
howitzers--Colonel Jubal A. Early's Sixth Brigade, of three Infantry
regiments and three rifled pieces of Walton's Battery, being posted in
the rear of, and as a support to, Ewell's Brigade.

[Johnston also found, on the 20th, the Reserve Brigade of Brig.
Gen. T. H. Holmes--comprising two regiments of Infantry, Walker's
Battery of Artillery, and Scott's Cavalry-with Early's Brigade, "in
reserve, in rear of the right."]

The disposition and strength of Beauregard's forces at these various
points along his line of defense on Bull Run stream, plainly shows his
expectation of an attack on his right; but he is evidently suspicious
that it may come upon his centre; for, as far back as July 8th, he had
issued special orders to the effect that:

"Should the Enemy march to the attack of Mitchell's Ford, via
Centreville, the following movements will be made with celerity:

"I. The Fourth Brigade will march from Blackburn's Ford to attack him on
the flank and centre.

"II. The Third Brigade will be thrown to the attack of his centre and
rear toward Centreville.