Twin brothers are serving in the French army during the Great War. Jacques, a private, leads his brothers company to attack when Honoré, a lieutenant, panics and flees. Jacques, dressed in Honorés coat, wins a vital victory, but he is mistaken for Honoré and decorated for gallantry in his brothers name. Jacques assumes Honorés identity and goes to Paris where he meets Honoré. Honoré, after a serious disagreement, plots to have Jacques murdered but is himself killed by mistake. Jacques finds happiness with Moira, Honorés wife from a loveless war marriage of convenience. Honor First was the first film Adorée and John Gilbert made together.