World War I continued with fury in the spring of 1918 as American Yanks endeavored to play the key role in stemming the German tide. Montana’s Marines suffered the bloodiest day in their history as they became Devil Dogs, charging through hell on earth at Belleau Wood. Locals in the Wild West Division stormed over the top into the Argonne Forest, while nurses, hello girls, Navy Yeomanettes and YMCA workers blazed new gender roles. And young Seaman Mike Mansfield, future legendary senator, served on convoy duty against lurking German U-boats. Award-winning historian Ken Robison illuminates the story of young and vibrant Montanans of all ethnicities as they fought for elusive democracy, at home and abroad, in this world war to end all wars.