That info is confirmed by the CWS&S at http://www.itd.nps.gov/cwss/soldiers.cfm

A. B. Newton (First_Last)
Regiment Name Yerger's Reg't, Mississippi Cav.
Side Confederate
Company A
Soldier's Rank_In Private
Soldier's Rank_Out Private

I am not sure just which unit is Yeagers, but here is a site that gives a brief unit history of Miss. units

http://www.mississippiscv.org/mississippi_history.htm

George