The Imperial Fists
The Imperial Fists are one of the First Founding Chapters of the Space Marines and were originally the VII Legion of the Legiones Astartes raised by the Emperor Himself from across Terra during the Unification Wars. They are the inheritors of the proud traditions of their Primarch Rogal Dorn, his name venerated by countless trillions across the Imperium.
Dorn and his Legion proved the masters of every aspect of warfare, but in particular the Imperial Fists excelled at siege craft, whether on the attack or the defence. This propelled them into a bitter rivalry with the Iron Warriors Legion and their jealous Primarch Perturabo, the ﬂames of which were wantonly fanned by Fulgrim, the Primarch of the Emperor's Children Legion.
Though Rogal Dorn was lost to the Imperium subsequent to the war-torn age of the Horus Heresy, his legacy remains one of the strongest of all of the Primarchs. The Imperial Fists sired three Second Founding Successor Chapters -- the Imperial Fists themselves, the Crimson Fists and the Black Templars. Between them, these three Chapters hold as many battle honours as dozens of later created Astartes formations, and their brethren have served with skill and distinction on countless thousands of battlefelds across the galaxy.
The Imperial Fists are one of the most valiant of all Chapters, held as paragons of the principles set down in the Codex Astartes and exemplars of everything to which a Space Marine is heir. The Imperial Fists stand as the steadfast defenders of the Imperium and the Emperor's unwavering shield; for ten thousand standard years they have been the bulwark against which the armies of Traitors and aliens have shattered.
While Rogal Dorn is lost, his legacy remains the strongest of all of the Primarchs'. Dorn's final moments were of courage and supreme sacrifice, and this example still drives the Imperial Fists onwards to fresh victories. Indeed, if the Imperial Fists have a fault, it is that they continue to strive when others would yield or withdraw. Such unquestioning steadfastness has rescued many a victory from the ashes of defeat paid for in lives.
978.M39 The Thule Intervention "A conclave of Eldar Farseers from the Iyanden Craftworld appeared without warning in the throne chamber of the Planetary Governor of Thule. The inscrutable xenos issued the planetary ruler with simple demand -- the entire human population must depart Thule within the month or be ejected by force. Before the Planetary Governor could answer, the Farseers vanished. Being a coward, he soon decided to flee Thule and abandon his people to their fate rather than face the wrath of the Eldar. A month later, a large Eldar army arrived at Thule, only to find a deployment of Space Marines from the Crimson Fists Chapter dug in, and arrayed in force against them. Finding themselves trapped the Eldar attempted to withdraw, the Crimson Fists inflicting heavy losses before the last of the xenos escaped."-'Imperial Armour Volume Two