Harvey's Scouts was one of four recognized "scout" commands Forrest speicified (I think) in the fall of 1864, with the stipulation that no other such "scouts" would be recognized or tolerated, with the implication that deserters and others wishing to escape regular duty might designate themselves as scouts. Henderson's Scouts was another such recognized unit which provided intelligence for the cavalry corps.

I found one report that indicated that one man, from a Louisiana cavalry unit, attached to Harvey's Scouts followed and reported on the movements of Croxton's Federal brigade following the skirmish at Trion, March 31-April 1, 1865. He reported the brigade's crossing of the Warrior River at Johnson's Bend, forty miles above Tuscaloosa, when Croxton and many of his officers likely thought that Southern forces presumed that the brigade had returned to north Alabama. Clearly these units rarely operated as complete units but as squad-size detachments (or even singly) in particular intelligence-gathering assignments. Croxton's brigade captured a number of Confederate cavalrymen in eastern Picken County in April of 1865, in the general area of where Henderson's scouts were reported in the OR to be operating. Many of these men gave spurious unit designations to their captors (i.e. Thirteenth Mississippi Cavalry, wholly consisting of a sergeant and seven men according to CMSRs). These scout unites may have been considered somewhat analagous to spies by Federal forces and treated (and executed) as such.