R W Johnson was a infantry officer and later (1864) was a cavalary officer in Thomas' army Under James Harrison Wilson. His work is very political in that he doesn't step on any toes especially of Grant or Sherman. The book was written in 1881, eleven years after Thomas died. At this time he was a professor of a Missouri college. It does have some good context on letters on attending statue unvieling of the equestian statue on Thomas. There are some new facts in the book but for the most part he is very brief on the battles without much detail. ( )