With the ending of the Spanish Civil War, a dispirited band of volunteers from the International Brigades seeks refuge in France. But on reaching the frontier, the band is disarmed, and all are detained as political prisoners. Then come instructions from Vichy that all fit prisoners are to be sent to Morocco to work on the Sahara railway for the Germans. However, one man manages to escape to London with vital information for the Allies.
| Costume & Make-Up | Anna Duse | Costume Design |
| Writing | Edward Dryhurst | Screenplay |
| Production | Warwick Ward | Producer |
| Directing | Mutz Greenbaum | Director |
| Editing | Flora Newton | Editor |
| Writing | Rudolph Cartier | Story |
| Sound | Ken Ritchie | Boom Operator |
| Production | Laurie Lawrence | Unit Production Manager |
| Camera | Basil Emmott | Director of Photography |
| Camera | Geoffrey Faithfull | Director of Photography |
| Sound | J.S. Davie | Sound |
| Directing | Gerry Mitchell | Second Assistant Director |
| Directing | Eric Pavitt | Third Assistant Director |
| Art | Maurice Pelling | Draughtsman |
| Camera | Manny Yospa | Focus Puller |
| Editing | P. Woods | Assistant Editor |
| Art | J. Charles Gilbert | Art Direction |
| Sound | Bert Ross | Sound |
| Camera | Ronald Anscombe | Camera Operator |
| Sound | Harry Benson | Sound |
| Camera | Austin Dempster | Camera Operator |
| Costume & Make-Up | Bob Clark | Makeup Artist |
| Writing | Warwick Ward | Adaptation |
| Sound | Mischa Spoliansky | Original Music Composer |
| Sound | Charles Williams | Conductor |
| Crew | Margaret Steen | Additional Dialogue |
| Directing | Frank Hollands | Assistant Director |
| Art | D.W. Daniels | Art Direction |
| Sound | Stan Jolly | Sound |
