Introduction : the purple death -- "The Yanks are coming" -- The Spanish lady -- "Blue as huckleberries and spitting blood" -- "Over the top" : a brief history of World War I -- "Over there" : the first wave -- Spring-summer 1918 -- "Obey the laws and wear the gauze" : the second wave - Autumn 1918 -- The world turned upside down -- Peace and plague -- Back to Brevig mission -- Afterword : relapse?