"Der Wehrwolf: Eine Bauernchronik" by Hermann Löns is a novel published in 1910. Set during the Thirty Years' War, it follows Harm Wulf, a farmer who loses his family to the conflict's violence. Transformed by grief into a relentless defender, he becomes the "Wehrwolf"—the defending wolf—and rallies fellow peasants to fight back against marauding soldiers. Together, they form a brotherhood that takes brutal vengeance on those who threaten their land, creating a fortified refuge in an ancient stronghold.