I ran accorss an old posting from Bryan Howerton that indicates that the 44th Arkansas Infantry/Mounted Infantry/Cavalry was the official designation of the 29th Arkansas Cavalry Regiment, AKA McGehee's Arkansas Cavalry! See below!

The Arkansas in the Civil War Message Board - Archive

Re: McGehee's Regiment - 29th Arkansas Cavalry

Posted By: Bryan Howerton
Date: Monday, 27 June 2005, at 10:32 a.m.

In Response To: McGehee's Regiment - 29th Arkansas Cavalry (Cindy Graham)

McGehee's Regiment was officially designated by the State Military Board as the 44th Arkansas Mounted Infantry, but I have found no record where this designation was ever used in the field, except for some prisoner-of-war records. Although the alternate designations of 29th Arkansas Cavalry and 44th Arkansas Cavalry were used on rare occasions, it was almost always referred to simply as "McGehee's Regiment."

McGehee's Regiment was one of several 40-series mounted infantry regiments organized in northeast Arkansas in the summer of 1864 in preparation for the invasion of Missouri later that year. Apart from the Missouri Campaign (September and October 1864), the regiment served in the Northern Sub-District of Arkansas, and surrendered at Wittsburg, Arkansas, on May 25, 1865 (some elements surrendered at Jacksonport on June 5, 1865).