John Bunyan 
Holy War [PDF ebook] 
The Losing and Taking Again of the Town of Mansoul (Made by King Shaddai Upon Diabolus, to Regain the Metropolis of the World)

Lively battle scenes and profound theological truths, all wrapped up into one fascinating and engaging package. Dive into John Bunyan’s long-form allegory The Holy War for a glimpse into timeless insights about Christianity, faith, purity, and perseverance from the author of the Christian classic, The Pilgrim’s Progress.