Linda --
Never thought this was much of a mystery. There are many good Forrest biographies, all mentioning the tragic death of Col. Jeffrey Forrest at Okolona --
http://www.geocities.com/scv323/SCVindex.html
Forrest's Cavalry Regiment was broken up afterwards, part of the regiment forming the 11th Alabama Cavalry. The remainder was assigned to Newsom's 18th Tennessee Cavalry --
http://www.tngenweb.org/civilwar/csacav/csa18cav.html
In this oversized image it's easy to see the family resemblance.