Interesting...I wonder what that was. I’m not a Civil War buff by any means, so hopefully someone else would have some insight. (or....there’s another movie to be made! :))
FOUND IT! TAP ROOTS with Van Heflin and Susan Hayward.
https://en.wikipedia.org/wiki/Tap_Roots
http://www.imdb.com/title/tt0040861/?ref_=fn_al_tt_1