From Dutch news agency ANP:
The film, with English narration by Ernest Hemingway [see also here; and here], contains images, never seen in Spain itself before, of the bloody civil war (1936-1939), British paper The Times wrote on Tuesday.
The film is about the fight between the rebels, led by General Francisco Franco and the republican government troops near Madrid in 1937.
The showing of the film now is because of the coming seventieth anniversary of the beginning of the war.
More on Hemingway and the Spanish Civil War: here.
David Walsh on films and politics: here.