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A collapsing defense was by far a brutal affair that extracted the maximum toll for those advancing. Such was characterized when the Daemons of Nurgle finally came falling into the trenches or crawling upon the buildings that were scattered all about. Their disease was rotting through the numerous ramparts quickly with the Astartes that were still present upon the field taking out their chainswords to knock off the boarders.
Those who were not transhuman, such as the Skitarii and Auxilia that remained, were forced to fight for their lives with guns and bayonets. The Nurglings were easiest to kill but they were in such a large quantity that it would boggle the mind at how dangerous they were. Such was the reason those who survived the longest were those that took themselves into groupings about the falling trenches.
The Omnissiah paid witness to this and knew how to maximize its potential. His mind focusing upon the batteries that were filling the air with the munitions crafted from the fallen Martian forges suddenly became possessed with something that could not be described other than a spirit. The crews quickly stopped bothering to guide the weapons and realized that their armaments were now self-aiming into the perfect locations across the falling battleline.
All about the collapsed front shells were tossed. While the toads and beasts of Nurgle might not have had any issue fighting off stray fire these rockets were pinpoint with purpose. The purpose so profound that many of the Daemons found their reality-shifting starting to fail themselves.
None of those apart of the collapsing defense found their deaths caused by these attacks. Their lives being shielded just for a few moments by curtains of shellfire. Their deaths were, as all things, inevitable as the Flamers of Tzeentch reached a position where they could torrent the line with balefire.
As the tide of death was reaped the forces of Nurgle once again showed themselves on the other side of the curtain. Grievously wounded , the forces slowly dispersed themselves from the killing zone to a much more reasonable angle that would prove an issue for the firing weapons.