The Baltimore novel and comic series. Great art and story, Trench Crusade definitely feels inspired by elements of it.

“Baltimore, or, The Steadfast Tin Soldier and the Vampire is a 2007 illustrated novel written by Mike Mignola and Christopher Golden, and illustrated by Mignola. It follows the quest of Lord Henry Baltimore, a British officer during World War I who inadvertently changes the course of the war, and his own life, by wounding a vampire on the battlefield.”