IV. Brigadier-General Bonham's brigade, supported by Colonel Bartow's brigade, will march via Mitchell's Ford to the attack of Centreville, the right wing to the left of the Third Division, more or less distant, according to the nature of the country and of the attack.

The order to advance will be given by the commander-in-chief.

V. Colonel Cocke's brigade, supported by Colonel Elzey's brigade, will march via stone bridge and the fords on the right thereof to the attack of Centreville, the right wing to the left of the Fourth Division, more or less distant, according to the nature of the country and of the attack.

The order to advance will be given by the commander-in-chief.

VI. Brigadier-General Bee's brigade, supported by Colonel Wilcox's brigade, Colonel Stuart's regiment of cavalry, and the whole of Walton's battery, will form the reserve, and will march via Mitchell's Ford, to be used according to circumstances.

VII. The light batteries will be distributed as follows:

1. To Brigadier-General Ewell's command, Captain Walker's six pieces.

2. To Brigadier-General Jones', Captains Alburtis' and Stanard's batteries, eight pieces.

3. To Brigadier-General Longstreet's, Colonel Pendleton's and Captain Imboden's batteries, eight pieces.

4. To Brigadier-General Bonham's, Captains Kemper's and Shields' batteries, eight pieces.

5. To Colonel Cocke's, Colonel Hunton's and Captains Latham's and Beckham's batteries, twelve pieces.

VIII. Colonel Radford, commanding cavalry, will detail, to report immediately, as follows:

To Brigadier-General Ewell, two companies of cavalry.

To Brigadier-General Jones, two companies of cavalry.

To Brigadier-General Longstreet, two companies of cavalry.

To Brigadier-General Bonham, three companies of cavalry.

To Colonel Cocke, the remaining companies of cavalry, except those in special service.

IX. The Fourth and Fifth Divisions, after the fall of Centreville, will advance to the attack of Fairfax Court-House via the Braddock and turnpike roads, to the north of the latter.

The First, Second, and Third Divisions will, if necessary, support the Fourth and Fifth Divisions.

X. In this movement the First, Second, and Third Divisions will form the command of Brigadier-General Holmes; the Fourth and Fifth Divisions that of the second in command. The reserve will move upon the plains between Mitchell's Ford and stone bridge, and, together with the Fourth and Fifth Division, will be under the immediate direction of General Beauregard.

By command of General Beauregard:

THOMAS JORDAN,

Assistant Adjutant-General.

SPECIAL ORDERS,
HDQRS. ARMY OF THE POTOMAC,
Numbers -.
July 21, 1861-4.30 a.m.

The plan of attack given by Brigadier-General Beauregard in the above order is approved, and will be executed accordingly.

J. E. JOHNSTON,

General, C. S. Army.