Manuel Azaña
— Himself (President of Spain)
José Díaz
— Himself (Parliamentarian)
Dolores Ibárruri
— Herself
Enrique Lister
— Himself (Republican Army)
Commander Martinez de Aragón
— Himself (Republican Army)
Gustav Regler
— Himself (German writer)
Orson Welles
— Narrator (voice)
Ernest Hemingway
— Narrator (voice)
Jean Renoir
— Narrator (voice)