I've always found General Phil Sheridan to be a fascinating figure, and "Sheridan: The Life and Wars of General Phil Sheridan" was the first biography about him that I found. It's reasonably well written, chronicling Sheridan's early life, his attendance at West Point, and his meteoric rise to general officer rank in the early days of the Civil War. Author Roy Morris, Jr. also details Sheridan's post-Civil War military career as an unsuccessful military governor of Louisiana, an Indian fighter in the midwest, and ultimately as General-in-Chief of the U.S. Army. Especially interesting was Sheridan's relationship with George Armstrong Custer, which Morris traces from their days fighting together during the Civil War, to the time of Custer's death at Little Big Horn.
I did find a problem with this book, despite its being fairly well written. While it provided some reasonably detailed information on Sheridan's life, times and personality, I didn't feel that it approached depth found in the best biographies of military leaders. When I finished "Sheridan," I felt I hadn't really been introduced to the man; I almost got the feeling Morris left out information in order to keep down the length of the book (which runs only to 393 pages.)
"Sheridan" is a good basic survey of one of the great U.S. Army generals of the 19th century, but it's not a particularly penetrating study of General Philip Sheridan's life and times. In my view, Phil Sheridan deserves better.