A pro-Republican propaganda documentary from the Spanish Civil War that combines real images of industrial and agricultural production with fictionalized scenes of fighting on the Aragon front.
| Directing | Joaquín Giner | Director |
| Writing | Ramón Oliveras | Writer |
| Writing | Y.C.M. Baena | Writer |
| Camera | S. Parera | Camera Operator |
| Sound | R. Sagrera | Sound |
| Editing | Antonio Cánovas | Editor |