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Legions D'Honneur begins during the final stages of a military court-martial. The tribunal demands that lieutenant Albert Jacquin explain how he received the gunshot wound which prevented him from returning to his regiment. When he refuses to do so, it is determined that Jacquin shot himself to avoid service, and he is stripped of his rank. Re-enlisting as a private, Jacquin at last decides to tell his story in its entirety to his attorney Pierre Renoir. The hero's reminiscences are filled to overflowing with amorous intrigue involving Marie Bell, the wife of his superior officer Charles Vanel. With a final, characteristically self-sacrificial gesture, Jacquin is able to secure Bell's future happiness at the expense of his own.