The Montgomery Weekly Mail for 11 January 1861 contains the following notice.

Cavalry Regiment. We omitted to mention yesterday that on Tuesday, the glorious Eighth, a Cavalry Regiment was formed here; (its number we have not learned;) with the following officers:
GABRIEL B. DU VAL, Colonel
----- GOODWYN, Lieutenant-Colonel
J. H. CLANTON, Major
There are several of the best volunteer companies in this Regiment; that we have ever seen. Our own "Mounted Riflemen" is a crack company indeed; and we long for them to have a chance to crack at the enemy. The Line Creek Cavalry, Capt. BLAKELY, is, for its age, well drilled and will prove very efficient.
The officers elect are gentlemen of high character, intelligence and loyalty. The men who compose the several companies are gentlemen of that sort to which Alabama may safely confide the keeping of her honor. We wish speedy service and a glorious fame to the new Cavalry Regiment.

I'm assuming that this regiment is the same as that listed in CSR Alabama Miscellaneous under Du Val's command - the 1st Alabama Mounted Men (State Service).

J. H. Clanton is presumably James H. Clanton, Captain of the Montgomery Mounted Rifles, 1st Alabama Cavalry, later becoming Colonel and Brigadier General.

Capt. Blakely is presumably Captain David T. Blakey, who also commanded a company in the 1st Alabama Cavalry, later becoming Colonel.

--- Goodwyn may well be Thomas J. Goodwyn, who was a Lieutenant in Clanton's Company.

The date of organization of the 1st Alabama Cavalry is usually given as November 1861 but it seems that it may have had its origins in Du Val's Regiment.