An American who volunteers for the Italian ambulance corps before the United States joins the war. Various Italian characters also refer to him as "Tenente" (Lieutenant) or "Federico" (Frederic). Henry is a classic Hemingway hero in that he is a stoic who does his duty without complaint. Yet Henry also undergoes tremendous development through the course of the novel. At the beginning of the novel, he has never experienced true loss, believes that war is dreadful but necessary, has a lust for adventure, drinking, and women, and sees Catherine as just another diversion. As the stakes of the war intensify, however, he becomes deeply pessimistic about the war and realizes that his love for Catherine is the only thing he is willing to commit himself to.