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Mantis Warriors
From Warhammer 40k - Lexicanum
During the Badab War, the Mantis Warriors had, for some reason sided with the Astral Claws; along with the Executioners, and the Lamenters.
The first recorded involvement by Loyalist Marines came in 904 M41, when the Fire Hawks were drawn in by an attack from the Mantis Warriors. In 907 M41 the worlds occupied by the Mantis Warriors and Executioners were recaptured by two Marine Chapters.
In 912 M41 the Mantis Warriors were granted the Emperor's forgiveness, and sent on a one hundred year crusade. Their homeworld, along with that of the Executioners, was forfeited to other space marine chapters that had taken part in the Badab War