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The seventy Loyalists led by Captain Garro commandeered the Imperial frigate Eisenstein and evading the forces of Horus, were able to escape from the Isstvan system into the Immaterium. The Eisenstein was badly damaged during its escape from Isstvan III; all its [[astropath]]s were dead, and its lone [[Navigator]] was mortally wounded. However, Garro managed to attract the attention of passing Loyalist ships by setting the vessel's warp engines to self-destruct and ejecting them from the ship. Rogal Dorn's Imperial Fists Legion had been becalmed in the Warp with its fleet for some time, and his Navigators sensed the detonation of the Eisenstein's Warp drives. Making an immediate course for the location of the ship's beacon, Dorn met with Garro, who explained to him all that had happened with the Traitor Legions.

The fate of these seventy Marines is ultimately unknown. Some believe they continued to fight for the Emperor until death claimed them, while others maintain that they were treated as if they were their traitorous brethren, either imprisoned and left to rot, or executed. Others believe that Captain Garro, shocked by the terrible betrayal, became an Apothecary, vowing never to kill again. Others believe some of these men formed the nucleus of the elite Space Marines Chapter later known as the [[Grey Knights]], for [[Malcador the Sigillite]] had presented eight of the survivors to the Emperor before his departure. These men were gifted [[psyker]]s, came from the ranks of the Legions that had turned Traitor, and yet maintained both an unbreakable faith in the Emperor and talent for resisting the temptations of Chaos.