Below are the two reports you refer to from the Official Records.
Official Records -SERIES I--VOLUME XLIX/2 [S# 104]
Union Correspondence, Orders, And Returns Relating To Operations In Kentucky, Southwestern Virginia, Tennessee, Northern And Central Georgia, Mississippi, Alabama, And West Florida, From March 16 To June 30, 1865.
Page 490
RUTLEDGE, TENN., April 27, 1865.
Major-General STONEMAN,
Commanding District of East Tennessee:
GENERAL: I have the honor to report that I have been scouting the country on both sides of the mountains; that I have captured two very notorious characters--Dr. J. P. Legg and P. H. Starnes--and sent them to Knoxville by Lieut. Henry E. Jackson, of the Ninth Tennessee. Since I captured Legg and Starnes the remaining guerrillas want to
Page 491 come in and give themselves up, but they are afraid that they will be executed for what they have already done. I have five prisoners who gave themselves up, and they say all the rest of them would come in if they knew that I would spare their lives.
I am, general, very respectfully, your obedient servant,
J. W. HARRINGTON,
Captain Company G, Ninth Tennessee Cavalry.
Official Records.--SERIES I--VOLUME XLIX/2 [S# 104]
Union Correspondence, Orders, And Returns Relating To Operations In Kentucky, Southwestern Virginia, Tennessee, Northern And Central Georgia, Mississippi, Alabama, And West Florida, From March 16 To June 30, 1865.
Page 528
RUTLEDGE, TENN., April 30, 1865.
[Major-General STONEMAN,
Commanding District of East Tennessee :]
GENERAL: I have the honor to inform you that I have been constantly scouting both sides of the Clinch. There are but few guerrillas remaining in this vicinity, they having nearly all left since I came here. I have endeavored to carry out your instructions, but it is necessary to explain why I have taken some prisoners. When I found those men, the most of them had hidden or otherwise disposed of their arms, and others came and gave themselves up. I had not sufficient evidence at the time of their being bushwhackers or guerrillas, until they were identified by citizens who knew them to be such. In this manner several have come into my hands as prisoners. The most noted of these are Dr. J.P. Legg and P. H. Starnes, whom I captured north of the Clinch. I sent them to Knoxville by Lieutenant Jackson and squad of Ninth Tennessee Cavalry. I have seven prisoners now at this placer which I send to Knoxville by Sergt. Edward Stokeley and squad of my company. I have just received orders from Colonel Parsons to move, with my company, to Bull's Gap, which has created some excitement among the Union citizens of the town and vicinity, especially those grand jurors and others who are witnesses against prominent rebels. Many of the citizens have called on me this morning
Page 529 and desired me to state to the general commanding that their lives will be endangered by the removal of the soldiers from the place. On their behalf, if it is not inconsistent with the service, [I request] that my company be ordered to garrison this place until it may be considered safe without a military force.
I have the honor to be, general, very respectfully, your obedient servant,
J. W. HARRINGTON,
Captain Company G, Ninth Tennessee Cavalry.
This would mean that the group were guerrillas and guerrillas were not sanctioned by the government in any shape, form, or fashion. The closest of any group to ever be sanctioned by a state or the Confederate government would have been Mosby's Rangers in Virginia. Everyone else were basically rogue groups often claiming affiliation with one side or the other but often were out for their own nefarious gain. They will not be on any roster as an organization such as "Tennesseans in the Civil War, Part 2" or the National Park Services Soldiers & Sailors System. There will not be Compiled Military Service Records for them like normal soldiers. You may want to check the National Archives in the Records of the Provost Marshal General's Bureau (Civil War), Record Group 110.4 RECORDS OF STATE AND DISTRICT OFFICES 1861-72 (bulk 1861-68).
Two books you may want to refer to are War at Every door: Partisan Politics & Guerrilla Violence in East Tennessee, 1860-1869 by Noel C. Fisher and Mountain Rebels: East Tennessee Confederates and the Civil War, 1860-1870 by W. Todd Groce.
Hope this helps.
Respectfully,
Gerald D. Hodge, Jr.
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment
http://39thgavolinfrgt.homestead.com/39thHomepage.html