J'accuse! is a 1938 French 'Abel Gance' science fiction horror WWI film. It features Victor Francen, Line Noro, Sylvie Gance, and Marcel Delaître.
A traumatised World War I veteran builds a machine to prevent war. When the government subverts his machine and a second world war seems increasingly inevitable, in desperation the inventor summons the ghosts of the war dead to protest.