A pro-Republican documentary made during the Spanish Civil War. It details the offensives of the Durruti Column and the Ascaso Division on the Huesca front between March and April 1937.
| Writing | Ramón Oliveras | Writer |
| Writing | Carlos Martínez Baena | Writer |
| Camera | Adrien Porchet | Director of Photography |
| Camera | Felix Marquet | Director of Photography |
| Editing | Juan Pallejá | Editor |