"Diehard Rebels: The Confederate Culture of Invincibility" by Jason Phillips is a hardcover book published by the University of Georgia Press in 2007. The book delves into the Confederate culture during the Civil War period, specifically focusing on the military aspects and the sense of invincibility that permeated the Southern states. With 296 pages, the book offers a detailed account of the die-hard rebels who fought for the Confederate cause, providing valuable insights into this pivotal period in American history.