The film was directed by Jean-Paul Le Chanois and produced and co-written by Luis Buñuel, about the early days of the Spanish Civil War.
In 1937, Spanish newspaper El Sol said this of the film: Among the unique scenes in this film, special mention should be made of the following, due to their value as historical documents: the speech of Alvarez del Vayo at the League of Nations, the speech of La Pasionaria in Paris, the defence of Irún and San Sebastián by the Basque militiamen and the battles in the streets of Carabanchel, Casa de Campo, Parque del Oeste and Somosierra.
Never before have scenes of such realism been shown on the screen as in España 1936, the most authentic and realistic documentary made of this war.
Buñuel chronicled this film in his typical style showcasing the inhumanity, death, and destruction of the Spanish Civil War rather than focusing solely on a political message supporting one side or the other.
This notable style of Buñuel stands in contrast to other politically based documentaries of the time including Triumph of the Will, The Man with the Movie Camera, and Night Mail, among others.