I think I did one of my scrambled sentences! Sorry... John Allen Wyeth wrote That Devil Forrest: Life of Nathan Bedford Forrest in 1899. Jordan and Pryor wrote The Campaigns of Lieutenant General Nathan Bedford Forrest, and Forrest's Cavalry in 1868. Since then, there have been a few editions with different things added - sometimes extra information, sometimes edited for 'flowery and outdated' language, etc. So, I meant to recommend you start with the first editions of these two books!
Wyeth also wrote With Sword and Scalpel, which was about Joe Wheeler. He served with both Wheeler and Forrest, and was with Wheeler when he took that flying leap into the Duck River to keep Forrest's bacon out of the fire. (As it turned out, Forrest had already escaped the danger and there was no need for Wheeler to hit the water...)