J. B. Sleeth was a riverboat man from Paducah KY. Evidently Roddey knew this man from that line of work. In the summer of 1863 he received pay as a civilian employee of the Confederate government. As a "master workman" Sleeth repaired ferryboats and obstructed the Tennessee River near Tuscumbia. Late in the war Roddey mentioned Sleeth's Scouts as part of his command. To my knowledge "Captain" Sleeth was never in actual Confederte service.

The man you mentioned may be listed with the "Leighton Rangers" in 1863.
http://www.archives.state.al.us/civilwar/soldier.cfm?id=12203