Editing Setting:Cloudburst/Blue Daggers (section)

===The Siege of Sarenaak===
This massive conflict in early M41.805 constituted the largest mobilization of the Chapter up to that point.  The entirety of the Battle Companies and two hundred Marines from other Companies engaged in direct combat against the forces of the Pustulent Heaven-sent warband of Nurgle in the Naxos Sector.  The conflict began when the Pustulent Heaven-sent, led by Death Guard Terminator Andal the Corpulent, besieged the fortified Hive city of Halsstead on the planet Chyrox, just outside the Inquisitorial demarcation of the Pox Ring Containment Zone.  The Celestial Knights, engaging the Nurglites on two other fronts, were unable to dispatch aid.  Thus, the Blue Daggers took up the call.  Although their numbers were diminished by the losses they had suffered in the recent Fifth Glasian Migration, the Chapter still mustered over seven hundred Marines, nearly the full strength of the Chapter.  The Blue Daggers fell on the planet in a great surge, supported by orbital fire from their flagship, the ''Sharp Edge''.  The Nurglites were able to withstand the sudden arrival of the Imperial forces by forcing a breach in the city and occupying it from the inside.  The influx of Warp-spawned toxins there turned many of the residents into savage, mutated beasts, their bodies ripped to pieces by Nurgle’s own plagues, and the Nurglites sent them into the oncoming Daggers to weaken their resolve.  Undeterred, the Daggers retaliated with the fullest force of their Land Raider and Thunderhawk contingent, bringing Astartes arms to bear on the mostly-mortal Nurgle cult.  Within a month of intense combat, the infected population and the cult that had ruined them were dead, and Chyrox was left to rebuild.