The Grand Army of The Knights Of Sigmar's Righteous Fury

During the Storm of Chaos a large force of Empire troops from the North of Ostland was sent to Praag to aid the defenders. Allthough the defenders fought valiantly, the deamon-engines known as Hellcanons that the fierce northmen brought en masse incinerated the city. The entire city went up in a fiery inferno. The shatterd remnants of the empire survivers fled the heat of the flames in one of the few buildings that was not allready burning. It happened to be a small chapel dedicated to Sigmar. When the inferno around the soldiers increased in intensity a fissure opened up in the floor of the shrine leading to an underground network of caves, old sewers and disused cellars. Through this maze of forgotten rooms underneath the city the soldiers managed to escape the blazing inferno, resurfacing just behind the enemy lines. These few survivers of different regiments were saved thanks to their underground journey through the bones of the ancient city. Perhaps Sigmar himself showed his children the way?
Upon their return to Ostland it was clear most of the province was in ruins and their former regiments were wipe out. These few survivers that lived through the terribly ordeal beneath Praag decided to stay together and formed a new, elite regiment. In recognition to their ordeal the regiment was named Bonehunters.

Those of you who know Steven Erikson's work will recognise this tribute to his wonderfull books