The inhabitants of a small provincial town are requisitioned to take part in the French army's major maneuvers. A foreign spy takes advantage of these maneuvers to steal secret documents. The pursuit and capture of the spy and his accomplices are successfully carried out by all those taking part in the maneuvers.
| Actor | Role |
|---|---|
 Blanchette BrunoySonia Brévannes | Sonia Brévannes |
| CCélia CortezAnnie Desforges | Annie Desforges |
 Jean-Pierre KérienPierre Dumans | Pierre Dumans |
 Howard VernonRoger Kervec | Roger Kervec |
 Jacques CharonMaurice Favier | Maurice Favier |
| JJacques TorrensGuy Lormoy | Guy Lormoy |
| LLiliane ErnoutJacqueline Desforges | Jacqueline Desforges |
| GGabriel SardetLormoy | Lormoy |
 Charles LemontierProfessor Desforges | Professor Desforges |
| GGérard Le FaivreJean Lormoy | Jean Lormoy |
 Philippe HersentNot listed | Not listed |
| MMarco VillaNot listed | Not listed |
| PPaul AzaïsNot listed | Not listed |
| LLouise BazinNot listed | Not listed |
| BBéatrix BrunelNot listed | Not listed |
| DDanièle BréhatNot listed | Not listed |
| JJean-Louis CalvetNot listed | Not listed |
 Danielle DumontNot listed | Not listed |
| GGermaine GodefroidNot listed | Not listed |
| GGermaine LandaNot listed | Not listed |
 Jean MuratNot listed | Not listed |
| JJean NosserotNot listed | Not listed |
| CCharles RoyNot listed | Not listed |
| JJean ThielmentNot listed | Not listed |