Pyrrho Zeta secured by chaos

The Death Guard had finally settled on setting up a base on the world of Pyrrho Zeta in late 03.022M42 as a place to develop new pathogens to unleash onto the Imperium from a secure location away from prying eyes. By this time, the world was largely in the hands of chaos forces, with a number of factions having set up bases of operation on the main inhabitable world. The Deathwatch space marine chapter meanwhile, under the orders of the Ordo Xenos Inquisition, had observed the heretic astartes clashing with the tyranids, and became concerned that the worshippers of nurgle may be using Xenos biology in order to cross-mutuate a number of their pathogens.

This concern led to a small Deathwatch force investigating the chaos bases of Pyyrho Zeta with only minimal support from the rest of the Imperium. Upon landing however, their presence was detected, and the Death Watch moved to intercept them. The space marines then found themselves spending much of their time running from the chaos forces, before eventually being cornered at an old abandoned mining complex. Unable to flee further, the Deathwatch were defeated in a close run engagement, forcing the survivors to abandon the planet. The Deathwatch reported their findings (or lack of) to the high command on Ferrosiun, and the system of Pyyrho Zeta was labelled chaos controlled.