Howdy Glenn !
According to what I know, the 20th Tenn. Cav are "Russell`s". The "Nixon`s" are the 46th Tenn.Inf.
If you look at my post "Does anyone knows Mr.Price ?", the link there are to 20th Tenn.Cav (Russell`s).
If you really want to find out about him, Glenn; use Jim`s service on the board. They will find him.
http://history-sites.com/research/index.html
The site about General Forrest are in the pre-phase, so it will take a long time until there will be any info on the site.
Hope this helps,
Roy