User blog comment:Vivaporius/AT Idea: Imperial Civil War/@comment-3341288-20120408193232/@comment-3398633-20120410183003

The Imperium has a Christmas-esque holiday? Wow.

As for the Grey Knights, they are Imperial, as are the Blood Angels. But...the Grey Knights are occupied in the north keeping the daemonic hordes at bay, and the Blood Angels are campaigning in Segmentum Tempestus, and in the thick of the fighting with several other chapters.