Does anybody know a short story or book which deals with soldiers coming back home from World War I and their troubles to readjust to society?

There's a book called: legends of the fall by Jim Harrison, I'm pretty sure it involves World War I and the protagonist's loss of a brother in said war, and his struggle with that. If you're not a reader I recommend the movie adaptation (same title) and the advantages of the movie is the visual images of the story taking place.

Hope I helped.