The Oubliette

The Oubliette was the name of a defensive campaign conducted by the Castigators Space Marine Chapter against an outcast Iron Warriors warband led by the ancient Warsmith Ares Vrolok upon the Inquisitorial fortress world of Tynax.

History
The 3rd and 5th Companies fight in the defence of an Inquisitorial citadel besieged by a large splinter of the Iron Warriors Traitor Legion led by Warsmith Ares Vrolok. Cast out from the Iron Warriors, Vrolok had fought for ten thousand years to further his own aims, leading those loyal to him on a rampage across many worlds, gathering renegade Marines to his cause. Vrolok attached and besieged the Inquisitorial fortress world of Tynax after hearing rumours that precious STC fragments had been recovered by the Inquisition. An avid technophile, Vrolok was determined to have the fragments for himself, and assaulted Tynax. The Fortress was defended by a small contingent of Adepta Sororitas, attached to the personal retinue of Inquisitor Lord.

The Castigators' 3rd Company assaulted the Iron Warriors in an effort to delay the traitor Astartes. Whilst battle raged, elements of the 5th Company helped organise a rapid evacuation of the Fortress, ferrying the STC fragments to safety. The Techmarines hastily rigged charges within the fortress, designed to annihilate intruders. The Castigators retreated as soon as the relics were safe - the Captains knowing that the Space Marines would only dash themselves to pieces if they resisted the Iron Warriors for too long. After the battle, Captain Anteas received the master-crafted relic Sword of Sorrows from a Canoness of the Adepta Sororitas, in recognition of their heroic efforts.