THE BIG PARADE (1925)

This film is about an idle rich boy who joins the US Army's Rainbow Division and is sent to France to fight in World War I, becomes a friend of two working class men, experiences the horrors of trench warfare, and finds love with a French girl.
The film has been praised for its realistic depiction of warfare, and it heavily influenced a great many subsequent war films, especially All Quiet on the Western Front (1930). The Big Parade is regarded as one of the greatest films made about World War I, and in 1992 it was selected for preservation in the United States National Film Registry by the Library of Congress