Best fit I can get is Capt. Aeneas McAllister, Co D, 23rd Arkansas Infantry. Records are spotty at best for this unit as they were lost on Price's '64 Raid. The unit would have been available to Shelby though most of its officers were in prison after the unit surrendered at Port Hudson. Apparently the remnants were mounted and moved to NW Arkansas mid 1864. He was Captain as of October 1862 at Corinth MS. He was originally from Indiana. A fellow by the name of Sawyer is Capt of this unit in Dec 1864. What transpired in the interval I don't know, perhaps some folks on the Arkansas board can help.

McAllister, Aeneas—Private; born 1827 in Indiana; occupation merchant. is listed on the muster roll of the Crittenden Rangers.

From http://www.couchgenweb.com/civilwar/crittner.html

The Memphis Daily Appeal ran this article on April 17, 1861:

“MILITARY COMPANY—The citizens of Crittenden County, Arkansas, have raised a fine company, which they have styled the Crittenden Rangers. Officers are our late fellow-citizen R. T. Redman, Captain; T. B. Rogers, 1st Lieutenant; J. D. Rives, 2d Lieutenant; J. G. Berry, 3d Lieutenant. Captain Redman was in the city yesterday for the purpose of purchasing saddles and horse equipments for the company. The county court a week ago voted two thousand dollars toward the equipment of the rangers, the State finds them arms, and the citizens of the county have undertaken to provide them with pistols.”

By June 3, 1861, when the company enrolled in State service, new officers were elected, and the Rangers rode to Pocahontas, where they joined the garrison commanded by Lieutenant-Colonel Solon Borland. Shortly afterwards, the Governor of Arkansas offered the services of the Arkansas State Troops to the Confederate States. The soldiers were given the option of enlisting in Confederate service for a period of twelve months, or taking a discharge. About half the Rangers took the discharge. The rest of the Crittenden Rangers enlisted in Confederate service on July 29, 1861, and were assigned as Company C, 6th Battalion Arkansas Cavalry, CSA. This battalion was later expanded to a full regiment, the 2nd Arkansas Cavalry.

John R