Thomas E. Caffey was a private in Co. D (Hamer Rifles, raised in Yazoo County, MS), 18th MS Infantry.
If you Google "Thomas E. Caffey," you'll find a few "hits" that list him as author of this work.
I had to deduce his identity from reading part of the book, then searching for Yazoo County companies, and, finally, by searching the NPS S&S site for soldiers in MS units that served in VA for men with the initials "T.E.C."
Had fun doing it, though! Enjoy! -- Jim Huffman, Gainesville Vols