France, 17th century, during the reign of Louis XIII. When a dear friend, the Duke of Nevers, is treacherously assassinated by a powerful relative, a skilled swordsman, the noble Henri de Lagardère, seeks his rightful vengeance as he tries to protect the innocent life of the duke's last heir.
Unfortunately the movie On Guard is not yet available on HBO Max.
| Directing | Philippe de Broca | Director |
| Crew | Ian Burley | Translator |
| Crew | Philippe Guégan | Stunts |
| Camera | Philippe Canu | Grip |
| Crew | Guillaume Castillon | Stunts |
| Production | Nora Salhi | Production Accountant |
| Production | Gianluca Lazzaroni | Production Secretary |
| Sound | London Symphony Orchestra | Music |
| Costume & Make-Up | Brigitte Bourneuf | Costumer |
| Crew | Christophe Maratier | Armorer |
| Crew | Christian Hening | Stunts |
| Crew | Corinne Devaux | Choreographer |
| Costume & Make-Up | Tess Hammami | Costumer |
| Crew | Alain Saugout | Stunts |
| Crew | Patrice Cossonneau | Stunts |
| Sound | Laurent Quaglio | Sound Supervisor |
| Lighting | Richard Vidal | Electrician |
| Camera | Yves Agostini | Camera Operator |
| Crew | Josy Venon | Stunts |
| Crew | Barbara Dupont | Stunts |
| Visual Effects | Christian Rajaud | Digital Effects Producer |
| Crew | Henri Lorente | Carpenter |
| Directing | Olivier Coutard | Second Assistant Director |
| Costume & Make-Up | Benoît Lestang | Makeup Artist |
| Art | Caroline Ruelle | Location Scout |
| Costume & Make-Up | Florence Sadaune | Assistant Costume Designer |
| Sound | Valérie Lindon | Music Producer |
| Crew | Pascal Guégan | Stunts |
| Crew | Guy Di Rigo | Stunts |
| Art | Patrick Boshart | Location Scout |
| Camera | Alain Dutartre | First Assistant Camera |
| Crew | Michel Anderson | Stunts |
| Crew | Bertrand Terreyre | Carpenter |
| Production | Rita Rusić | Co-Producer |
| Crew | Jean-Louis Airola | Stunts |
| Production | Michel Jullien | Unit Production Manager |
| Production | Didier Abot | Assistant Unit Manager |
| Production | Vittorio Cecchi Gori | Co-Producer |
| Camera | Jean-Paul Agostini | Second Assistant Camera |
| Crew | Philippe Morel | Stunts |
| Crew | Pascal Madura | Stunts |
| Visual Effects | Paul Swendsen | Matte Painter |
| Art | Jiri Hanibal Jr. | Sculptor |
| Art | Emmanuel Rondeau du Noyer | Location Scout |
| Editing | Pauline Casalis | Assistant Editor |
| Production | Catherine Deserbais | Extras Casting |
| Camera | Jean-Marie Leroy | Still Photographer |
| Crew | Lionel Vitrant | Stunts |
| Art | Sylvie Deldon | Assistant Decorator |
| Directing | Delphine Bouix | Third Assistant Director |
| Costume & Make-Up | Michel Deruelle | Makeup Artist |
| Crew | William Cagnard | Stunts |
| Visual Effects | Fred Place | Digital Compositor |
| Art | Stéphane Cressend | Property Master |
| Crew | Patrick Médioni | Stunts |
| Crew | Daniel Breton | Stunts |
| Directing | Serge Onteniente | Assistant Director |
| Production | Olivier Lagny | Assistant Production Manager |
| Visual Effects | Christian Guillon | Special Effects Supervisor |
| Art | Marc Renault | Property Master |
| Production | Françoise Galfré | Executive Producer |
| Visual Effects | Isabelle Roussel | Digital Compositor |
| Visual Effects | Frédéric Moreau | Visual Effects |
| Art | Ivan Casidanus | Assistant Property Master |
| Directing | Vincent Dachet | Third Assistant Director |
| Costume & Make-Up | Stephanie Orillard | Makeup Artist |
| Crew | Jean-Claude Braquet | Stunts |
| Crew | Christian Bergner | Stunts |
| Costume & Make-Up | Michèle Constantinides | Makeup Artist |
| Crew | Alain Barbier | Stunts |
| Sound | William Flageollet | Sound Re-Recording Mixer |
| Production | Yann Arnaud | Assistant Unit Manager |
| Crew | Vincent Sentis | Carpenter |
| Costume & Make-Up | Nathalie Tabareau | Makeup Artist |
| Writing | Jérôme Tonnerre | Writer |
| Production | Patrick Godeau | Producer |
| Sound | Philippe Sarde | Original Music Composer |
| Camera | Jean-François Robin | Director of Photography |
| Editing | Henri Lanoë | Editor |
| Art | Bernard Vézat | Production Design |
| Sound | Henri Morelle | Sound |
| Writing | Jean Cosmos | Screenplay |
| Writing | Philippe de Broca | Screenplay |
| Writing | Paul Féval | Novel |
