There might be a clue in the assignments of his 1st Louisiana Cavalry

Regiment Assignments 1st Louisiana Cavalry

Scott's Brigade
Aug. 62 to Oct. 62 Dept. of Kentucky
Oct. 62 to Nov. 62 Dept. of East Tennessee
Jul. 63 to Aug. 63 Scott's Cavalry, Dept. of East Tenn.
Sep. 63 to Oct. 63 Pegram's Div., Forrest's Cavalry, Army of Tenn.
Jun. 64 to Aug. 64 W. Adams' Cavalry, Dept. of Al., MS, & E La
Dec. 64 to Feb. 65 Scott's Cavalry, Dist. of MS & E. La., Dept. of Al., MS, & E La
Feb. 65 to May 65 dist. of N. MS &W. TN, Dept. of Al., MS, & E La

American Civil War Research Database, Historical Data Systems, Inc.