Deathwatch - Chapter Rivalries: The recruitment processes for the Chapters of the Adeptus Astartes are as varied as the iconography on their power armour. Some recruit exclusively from the lands of their homeworld while other Chapters utilise a wide swathe of planets for finding new battle-brothers, drawing from worlds scattered throughout the Chapter's dominion.No matter where the initiates are recruited from, one thing remains the same -- the new Space Marine will undergo a long, rigorous series of challenges and trials before he is fully one of the Emperor's finest. It is through these tests and trials that the bonds of brotherhood are first forged for the Space Marines.The time spent learning the beliefs and battle doctrines of their Chapter shapes the mind-set of the battle-brothers and how they view their duty to the Imperium and Chapter. These fundamental beliefs are so strongly ingrained into a battle-brother that they can bring him into conflict with other Imperial servants who have a different world view than the Chapter. These are the challenges all members of the Deathwatch must overcome if they are to serve their ancient oaths successfully.When a Chapter sends one of its brothers off to serve the Deathwatch, it can be something of a culture shock to the Space Marine in question. Everyone expects a Space Marine to follow whatever orders he is given, but behind the armour is more than an automaton.A battle-brother's training and beliefs are deeply ingrained, even part of his genetic make-up, so coming to grips with his new role in the Deathwatch can be very trying -- not that an Astartes would ever let that be known.Becoming part of a new squad under the auspices of the Deathwatch organisation creates many new challenges for an inductee. First of these trials is determining his role amongst his new squad-mates. He must learn how to fight alongside these new battle-brothers who each bring their own battle tactics and methods to the unit.In many instances these strategies may directly contradict his own way of waging war. For someone who has fought a certain way for a long time (in some instances a standard century or more), adapting is no small feat.Unfortunately, the greatest fighting force of Mankind -- the Space Marines -- possesses a long history of distrust, enmity, and open warfare with their brethren, and that is only including the Loyalist Chapters.For over ten thousand standard years, the Adeptus Astartes have fought alongside and against other Space Marines in countless battles. The Great Crusade set the stage for many of the most memorable feuds. During that time, each Legion of Space Marines tried to outdo its brothers in bringing glory to the fledgling Imperium.Fighting side-by-side, the original Space Marine Legions often came to blows over the best way to reclaim a planet that had fallen away from the Emperor's light.These feuds still exist into the present, and can become a grist for problems between members of a Deathwatch kill-team who hail from feuding Chapters. Among the worst of the currently existing feuds between Loyalist Chapters are the following:Dark Angels vs. Space Wolves - One of the most famous rivalries in the Imperium, the tension between these two Chapters dates back to the time of the Great Crusade and the brawls that their primarchs -- Lion El'Jonson and Leman Russ -- would engage in. While the two Chapters may not always get along, they actually possess a great deal of respect for one another and this rivalry is closer to competing brothers than anything else. The feud also extends to the Unforgiven Successor Chapters of the Dark Angels and any Space Wolves they may serve with in the Deathwatch.White Scars vs. Raven Guard - The tension between members of these two Chapters is darker and deeper than a friendly competition between allies. A Raven Guard views the White Scars with suspicion and open contempt in many instances, due to what he believes are failures to aid one another in times of need dating all the way back to the Horus Heresy. This can provide for interesting interactions between members of a kill-team with Astartes seconded from these Chapters as their new bonds of service to the Deathwatch and its sacred mission overwrite the troubles of the past.Space Wolves vs. Blood Ravens - The Space Wolves have a long history, dating back to the Great Crusade and the Edicts of Nikaea, of distrusting what they view as sorcery, and the highly psychic Blood Ravens Chapter has drawn their ire on more than one occasion. During the Battle of Praximil VIII, the Blood Ravens' reliance on Librarian intervention to oust the psyker leader of the Renegades entrenched there sent their Space Wolves allies into a fury. The Wolf Lord who fought at their side believed the use of psychic tactics to be dishonourable and he made this known to the Blood Ravens' force commander with a well-placed punch.Storm Wardens vs. Blood Angels - On the Night World of Etrimma, a small Blood Angels force had fought a prolonged campaign against a force of Drukhari raiders who were intent on securing the ancient ruins of the world for their own dark purposes. As the tide turned against the Blood Angels, a Storm Wardens' Strike Cruiser arrived on the scene to render aid. Without a word, hundreds of Storm Wardens descended on the battlefield and routed the Drukhari in a matter of solar hours. The overly proud Blood Angel captain did not take kindly to this unwelcome intervention. He was convinced that he could have handled matters himself and that his warriors were more than capable of dealing with the xenos threat on their own. For the Blood Angels who fought in this encounter and the brethren they shared the tale with, the Storm Wardens will always be viewed as unwelcome meddlers.Iron Hands vs. Ultramarines - A highly regimented Ultramarine values strict adherence to the Codex Astartes above all else. While the Iron Hands may structure their Chapter after the basic tenets of the Codex, they care little for the views of others and do not place much stock in the Ultramarines' complaints against their lack of orthodoxy, preferring to let their long record of service to the Imperium speak for itself. The Ultramarines particularly dislike the Iron Hands' obsession with replacing the organic portions of their bodies with augmetics, viewing it as tantamount to heresy and the result of a real flaw in the Iron Hands' gene-seed.