Brig.-Gen. Alfred Pleasonton :--First Brigade, Maj. Charles J. Whiting; 5th U. S., Capt. Joseph H. McArthur; 6th U. S., Capt. William P. Sanders. Second Brigade, Col. John F. Farnsworth; 8th Ill., Maj. William H. Medill; 3d Ind., Maj. George H. Chapman; 1st Mass., Capt. Casper Crowninshield; 8th Pa., Capt. Peter Keenan. Third Brigade, Col. Richard H. Rush; 4th Pa., Col. James H. Childs, Lieut.-Col. James K. Kerr; 6th Pa., Lieut.-Col. C. Ross Smith. Fourth Brigade, Col. Andrew T. McReynolds; 1st N. Y., Maj. Alonzo W. Adams; 12th Pa., Major James A. Congdon. Fifth Brigade, Col. Benj. F. Davis; 8th N. Y., Col. Benjamin F. Davis; 3d Pa., Lieut.-Col. Samuel W. Owen. Artillery, 2d U. S., Batt. A, Capt. John C. Tidball; 2d U. S., Batts.
B and L, Capt. James M. Robertson; 2d U. S., Batt. M. Lieut. Peter C. Hains; 3d U. S., Batts.
C and G, Capt. Horatio G. Gibson. Unattached, 1st Me. Cav.,
Detached at Frederick, Md. Col. Samuel H. Allen; 15th Pa. Cav. (detachment), Col. William J. Palmer.
les E. Capehart. Second Brigade, Brig.-Gen. George A. Custer; 1st Mich., Col. George H. Town; 5th Mich., Col. Russell A. Alger; 6th Mich., Col. George Gray; 7th Mich. (10 cos.), Col. William D. Mann.
horse artillery :--First Brigade, Capt. James M. Robertson; 9th Mich. Batt., Capt. Jabez J. Daniels; 6th N. Y. Batt., Capt. Joseph W. Martin; 2d U. S., Batts. B and L, Lieut. Edward Heaton; 2d U. S., Batt. M, Lieut. A. C. M. Pennington, Jr.; 4th U. S., Batt. E, Lieut. Samuel S. Elder. Second Bri S., Batt. K, Capt. William M. Graham; 2d U. S., Batt. A, Lieut. John H. Calef; 3d U. S., Batt. C., Lieut. William D. Fuller.
With Huey's Cavalry Brigade, and not engaged in the battle.
artillery reserve, Brig.-Gen. Robert O. Tyler, Capt. James M. Robertson. Headquarters Guard, 32d Mass. Inf., Co. C, Capt. Josiah C. Fuller. First Regular Brigade, Capt. Dunbar R. Ransom; 1st U. S., Batt. H, Lieut. Chandler P. Eakin, Lieut. Philip D. Mason; 3d U. S., Batts.
F and K, Lieut. John G. Turnbull;