When the Primarch Roboute Guilliman returned to the imperium he introduced the Primaris Space Marines to create new chapters and reinforce existing ones. This is due in part to the Chapter's role as close quarter shock assault and ambush tactics with precise accuracy.
Ever since the chapter's inception, the Wolves of Terra have garnered a reputation as being highly savage and relentless in combat, prosecuted with extreme ferocity to match the chapter's desire to eliminate all in their path. The Chapters created during this Founding were brutal and ruthless in the extreme. The first Chapters created during the 4 th Founding, which included the newly incepted Wolves of Terra, were charged by the High Lords to help re-establish order to an Imperium rife with civil discourse and insurrection, and to restore the rule of Imperial law. The High Lords of Terra intended to create hundreds of Chapter instead of only dozens to ring the Imperium in admanatium and ceramite. After several decades, enough gene-seed had been raised for the inception of a new Founding of Space Marine Chapter.
The newly instilled Lord Commander of the Imperium decreed that the Imperium would raise as many new Chapters as they had gene-seed in the great vaults of Terra to sustain. Though the Imperium ultimately emerged victorious, it was a pyrrhic victory at best as they had sacrificed much, including severe losses amongst the Chapters of the Adeptus Astartes. Since the Chapter's inception during the 4 th Founding after the War of the Beast, this massive Ork WAAAGH! nearly brought the Imperium to its knees. 8.1 Primarch's Curse: The Rageful Blood.