In Glory Die — Martin J. Dougherty

FANTASY: Disgraced cavalry officer Jervon Dessartes must redeem himself by retrieving the Thaumaturgical weapon Skyfire before his homeland is invaded. Matching his saber and pistol against treachery and the legacy of an ancient war, Dessartes plunges into battle against a clique of empire-building Thaumaturges. His options are victory or death in glory.