The film is a formidable piece of archival research on the Spanish Civil War, drawing on documents from the Soviet Union, the United States, France, Germany and Spain. Rossif is not a historian, but he teaches us the essential fact that the war was won thanks to the massive support of the Germans and Italians. The commentary is by Madeleine Chapsal, for the most part said by Jean Vilar and Suzanne Flon. The music is by Maurice Jarre. The producer is Nicole Stéphane. This film was not easy to make and was much attacked at its release by both the extreme right and the extreme left. The French government, in order to please the Spanish dictator
Franco, delayed the release of the film for more than a month and asked to cut some scenes. According to Nicole Stéphane's testimony in 2006, the Spanish government asked for twenty-five cuts and the French censors finally made six. ==Cast==