Ivens, Joris	...	(Director)
Ernest Hemingway, John Dos Passos	...	(Writer)
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 (English version) (later replaced by Ernest Hemingway)

Summary: This documentary tells of the struggles during the Spanish Civil War. It deals with the war at different levels: from the political level, at the ground military level focusing on battles in Madrid and the road from Madrid to Valencia, and at the support level. With the latter, a key project was building an irrigation system for an agricultural field near Fuentedueña so that food could be grown to feed the soldiers.