Treachery at Falchius

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The Treachery at Falchius was an Imperial castigation campaign carried out by the Adamant Wardens Space Marine Chapter upon the Imperial world of Falchius, against a large warband of the Iron Warriors Traitor Legion.

History
The Adamant Wardens send their whole chapter strength to the planet of Falchius. A long 10-Year campaign ensued with Precepts being reduced to nearly one third of their original strength by a large Iron Warriors warband who took over most of the world. The war was waged by the Iron Warriors, 5th Brigg Auxilia Dragoons and 28th Brigg Auxilia Infantry, Adamant Wardens, and Renegade Guard. The war was composed of many brutal sieges and assaults between the two siege specialists, grinding themselves against each other in a battle of grand attrition. Tank advances crushed each other, dreadnoughts grappled in competition over breaches, artillery shelled across the vast fields of what once was a loyal civilized world. It was a near stalemate, the Adamant Wardens only being saved by the noble Imperial Fists upon the reception of their distress signal and their proximity to Terra.

Even then the Wardens could do little more than a tactical withdrawal of their remaining forces after most of their number were dead, missing, or even fallen to heresy. The Lord Commander Virius swore vengeance upon the Iron Warriors and to this day they have a toxic and harsh rivalry with them alongside the Imperial Fists. The chapter has to hunker down for almost 300 years to recoup their losses via the use of Warden Ancient Valkior's gene-stock.