"This regiment was organized in April 1864 at Newbern, by adding a company to the nine of Hatch's battalion, which had entered the service the previous winter. [...]

Captains, and Counties from Which the Companies Came.

Tuskaloosa -- W. T. Poe.

Tuskaloosa -- L. N. Cole.

Sumter -- James V. Tutt.

Dallas -- M. M. Burke.

Greene -- G. G. Perrin; killed at Pine-barren Creek. Brett Randolph.

Marengo -- E. Charles England.

Tuskaloosa -- W. H. Lawrence; killed at Rome. E. W. Owen.

Chocta -- Eugene C. Rhodes; captured at LaFayette.

Greene -- James Harrison; captured at Lafayette.

Fayette -- W. H. Whitley." From Willis Brewer's Alabama:
Her History, Resources War Record, and Public Men From 1540 to 1872.

Which of these companies was the company added to what was originally the 9th [Hatch's] Home Guard Cavalry Battalion to form the regiment? Was it a previously existing company?

I haven't investigated this regiment, yet, but it would be expected to have a whole lot of Pickens County men [boys?] as seven of these nine companies were formed in counties which border Pickens.

Was this G.G. Perrin of Greene County a relative of Col. Robert O. Perrin? Or, of Dr. Robert O. Perrin of Tuscaloosa County? I believe that you and I have discussed these two Robert O.'s in the past.