Space Marine companies and strike cruisers were despatched across the void, responding to ancient accords or to reports of unimaginable destruction and warnings from their own sentry stations and outposts. Librarians of all Chapters received calls for assistance all at once. Fleets of barbaric craft drifted unannounced into systems in which Space Marine Chapters already fought Traitors and the xenos menace of other invader species. Space hulks smashed into recruitment worlds. Their attack moons appeared above Adeptus Astartes home worlds.
