The Confederate Army in this battle was organized as follows:
Army of the Potomac (afterwards First Corps), under Brig.-Gen. G. T. Beauregard:—Infantry: First Brigade, under Brig.-Gen. M. S. Bonham, 11th N. C., 2d, 3d, 7th, and 8th S. C.; Second Brigade, Brig.-Gen. R. S. Ewell, 5th and 6th Ala., 6th La.; Third Brigade, Brig.-Gen. D. R. Jones, 17th and 18th Miss., 5th S. C.; Fourth Brigade, Brig.-Gen. James Longstreet, 5th N. C., 1st, 11th, and 17th Va.; Fifth Brigade, Col. P. St. George Cocke, 1st La. Battn., 8th Va. (seven companies), 18th, 19th, 28th, and 49th Va. (latter, three companies); Sixth Brigade, Col. J. A. Early, 13th Miss., 4th S. C., 7th and 24th Va.; Troops not brigaded: 7th and 8th La., Hampton Legion, S. C., 30th Va. (cav.), Harrison’s Battn. (cav.); Independent companies: 10th Cav., Washington (La.) Cav.; Artillery: Kemper’s, Latham’s, Loudoun, and Shield’s batteries, Camp Pickens companies.
Army of the Shenandoah (Johnston’s division), Brig.-Gen. Joseph E. Johnston:—First Brigade, Col. T. J. Jackson, 2d, 4th, 5th, and 27th Va., Pendleton’s Batt.; Second Brigade, Col. F. S. Bartow, 7th, 8th, and 9th Ga., Duncan’s and Pope’s Ky. Battns., Alburti’s Batt.; Third Brigade, Brig.-Gen. Barnard E. Bee, 4th Ala., 2d and 11th Miss., 1st Tenn., Imboden’s Batt.; Fourth Brigade, Col. A. Elzey, 1st Md. Battn., 3d Tenn., 10th and 13th Va., Grane’s Batt.; Not brigaded: 1st Va. Cav., 33d Va. Inf.
The Federal Army, commanded by Brigadier-General Irvin McDowell, was organized as follows:
First Division, Brig.-Gen. Daniel Tyler:—First Brigade, Col. E. D. Keyes, 2d Me., 1st, 2d, and 3d Conn.; Second Brigade, Brig.-Gen. R. C. Schenck, 2d N. Y., 1st and 2d Ohio, Batt. E, 2d U. S. Art.; Third Brigade, Col. W. T. Sherman, 13th, 69th, and 79th N. Y., 2d Wis., Batt. E, 3d U. S. Art.; Fourth Brigade, Col. I. B. Richardson, 1st Mass., 12th N. Y., 2d and 3d Mich., Batt. G, 1st U. S. Art., Batt. M, 2d U. S. Art.
Second Division, (1) Col. David Hunter (wounded); (2) Col. Andrew Porter:—First Brigade, Col. Andrew Porter, 8th (militia), 14th, and 27th N. Y., Battn. U. S. Inf., Battn. U. S. Marines, Battn. U. S. Cav., Batt. D, 5th U. S. Art.; Second Brigade, Col. A. E. Burnside, 2d N. H., 1st and 2d R. I., 71st N. Y.
Third Division, Col. S. P. Heintzelman (wounded):—First Brigade, Col. W. B. Franklin, 5th and 11th Mass., 1st Minn., Batt. I, 1st U. S. Art.; Second Brigade, Col. O. B. Wilcox (wounded and captured), 11th N. Y. (Fire Zouaves), 38th N. Y., 1st and 4th Mich., Batt. D, 2d U. S. Art.; Third Brigade, Col. O. O. Howard, 3d, 4th, and 5th Me., 2d Vt.
Fourth (Reserve) Division,[8] Brig.-Gen. Theodore Runyon, 1st, 2d, 3d, and 4th N. J. (three months), 1st, 2d, and 3d N. J., 41st N. Y. (three years).
Fifth Division, Col. Dixon S. Miles:—First Brigade,[9] Col. Louis Blenker, 8th N. Y. (Vols.), 29th and 39th N. Y., 27th Penn., Batt. A, 2d U. S. Art., Rookwood’s N. Y. Batt.; Second Brigade, Col. Thomas A. Davies, 16th, 18th, 31st, and 32d N. Y., Batt. G, 2d U. S. Art.