Codex: Space Wolves (3rd Edition)

"The Space Wolves are the most barbaric of all the Space Marien Chapters. Their home planet is the harsh ice world know as Fenris, where savage tribes, from which the Space Wolves are recruited, are locked in a continual struggle for existence. Perhaps because of this, the Space Wolves have a proud, headstrong nature which makes them difficult to control or direct. But for all this, the Space Wolves are valorous and noble defenders of the people of the Imperium, and are amongst the bravest and most ferocious warriors I have ever met. I can say without a doubt that the Imperium would be a far more dangerous place without the Sons of Russ to protect it." - Inquisitor Bastalek Grim