The first thing that came to my mind was Newton's Regiment of Arkansas cavalry.

Following that hunch, I found the csr for a R. H. Secrise with Newton's 8th Arkansas Cavalry. The hand writing on his two cards could easily be mistaken for Secrese.

Newton's Regiment is found under 8th Arkansas Cavalry. The unit information card identifies it as Newton's 5th Ark Cav afterwards Morgan's 2nd also called 8th Ark Cavalry.

See also:
http://www.history-sites.com/cgi-bin/bbs62x/arcwmb/webbbs_config.pl?md=read;id=29073

The regiment went by a variety of unofficial names during its existence. When Colonel Robert Crittenden Newton was in command, it went by its official title of 5th Arkansas Cavalry. Colonel Newton was succeeded in December 1863 by Col. Thomas J. Morgan, formerly captain of Company C. Under Colonel Morgan's command, the regiment went by the designation 8th Arkansas Cavalry; but it was also known on occasion as the 2nd Arkansas Cavalry. The Compiled Service Records are filed under the designation 8th Arkansas Cavalry. The commanders of the 5th/2nd/8th Cavalry include Colonels Robert C. Newton, Thomas J. Morgan, and W. A. Bevens.
http://en.wikipedia.org/wiki/5th_Arkansas_Cavalry_Regiment