The 15th Confederate Cavalry Regiment was organized at Mobile, Alabama, early in 1864 by consolidating the five-company 3rd Florida Cavalry Battalion and five Alabama independent cavalry companies. It served in Quarles', Reynold's, Page's, I. W. Patton's, Liddell's, R. McCulloch's, and H. Maury's command. The regiment remained in the Mobile and Pensacola area, then moved to Louisiana where it fought at Tunica. Returning to Mobile it guarded the approaches to the city. A detachment was captured in the fight at Claiborne on April 17, 1865, and the remaining force at Demopolis on April 30. The Alabama companies were recruited in Mobile (3), Baldwin (1) and Choctaw (1) Counties. Company C was made up in Baldwin Co. Company D of Escambia County, Florida, "Bragg Mounted Rangers" Capt. J. B. Vaughn, formerly Captain of Company B, 3rd Florida Cavalry Battalion. Detached, on duty with the Engineer Department from September 1, 1863. Surrendered at Meridian, Mississippi, May 11, 1865. This company mustered in Confederate service and held elections at Pensacola, Florida, April 24, 1862. Officers and men later served as Company B, 3rd Florida Cavalry Battalion. Company "I" of Santa Rosa and Walton Counties, Florida, Capt. William B. Amos (formerly Captain of Company "D", 3rd Florida Cavalry Battalion). Paroled at Mobile, Alabama, June 8, 1865. Electing officers in Santa Rosa County, Florida, October 4, 1862, members mustered on October, 25, 1862, at Pollard, Alabama. This company served as Company "D", 3rd Florida Cavalry Battalion during the summer of 1863.