White Scars - Dawn of the Imperium, M30-M31: X173 Plural Xenocide (Unknown Date.M30) - This was an Imperial Compliance campaign of the Great Crusade that was carried out jointly between the White Scars Legion and the 40th Expeditionary Fleet's Imperial Army component made up of the genetically-enhanced soldiers of the G9K Division Kill upon the world designated X173 Plural. This campaign against unknown xenos was fought over a period of six solar months, in which the troops of the G9K came to admire the focus, dedication and mercilessness of the White Scars.Destruction of WAAAGH Mashogg (ca. Mid-800s.M30) - This was a joint Imperial Compliance campaign against the massive Ork empire of WAAAGH! Mashogg conducted by multiple Legiones Astartes, including the White Scars, Iron Warriors and Space Wolves alongside regiments of the Imperialis Auxilia and various Mechanicum assets. Legends record that it was the Primarchs Jaghatai Khan and Leman Russ who routed the Orks of Overdog Mashogg's WAAAGH!, while Perturabo was featured only as the "comrade" who calculated the optimum way to bypass Mashogg's low orbit defences.Compliance of the Araaki Spiral (ca. Mid-800s.M30) - This was a joint Imperial Compliance campaign conducted by multiple Legiones Astartes, including the White Scars, Dark Angels, Iron Warriors and Imperial Fists in a region of space known as the Araaki Spiral. The Araakites were well-versed in the art of building fortresses, and their strongholds were dug deep around narrow passes, remote hilltops and natural barriers in the landscape. Once again, the Iron Warriors were sent to a resistant star system to conduct brutal siege-warfare against formidable fortress-builders. The Araakites knew their craft well and the campaign to take their world for the Imperium proved both bitter and hostile.Compliance of Molech (869.M30) - The White Scars took part in the massive Imperial Compliance campaign on the newly discovered Knight World of Molech, which was led by the Emperor Himself, and included multiple Legiones Astartes, including the Luna Wolves, Dark Angels and the Emperor's Children, as well as thousands of troops of the Imperialis Auxilia and assets from the Mechanicum and Legio Titanicus. After achieving victory, Cyprian Devine of House Devine was named Planetary Governor of Molech. In the presence of several of His Primarch sons, the Emperor led them to a Warp portal hidden underground, where He proceeded to enter into the Realm of Chaos to parley with the Ruinous Powers. When He finally returned, the Emperor appeared aged, but much more powerful. He then suppressed His sons' memories of Molech and stationed a large garrison force comprised of nearly 100 Imperialis Auxilia regiments, three Legio Titanicus cohorts, and detachments from two Space Marine Legions to protect the secrets of the Warp portal on Molech.Tyrade System Compliance (998.M30) - A White Scars detachment served alongside the Luna Wolves Legion during the Imperial Compliance action in the Tyrade System. This action occurred seven standard years before the Battle of Istvaan III and the start of the Horus Heresy.Ullanor Crusade (999.M30-000.M31) - The Ullanor Crusade marked the high point of the Great Crusade's vast effort to reunite the scattered colony worlds of humanity. This vast Imperial campaign took place within the Ork empire of the notorious Ork Overlord Urrlak Urruk during the Great Crusade in the first year of the 31st Millennium. Ullanor, the capital world of this empire, and the site of the final assault, lay in the Ullanor System of the galaxy's Ullanor Sector. Horus employed the use of the now famous "Speartip" tactic to destroy the Ork Empire by removing its head. The White Scars and Ultramarines Space Marine Legions, supported by the Imperial Army and other forces such as the Titans of the Mechanicum, attacked the outer planets of the Ullanor System. This offensive was a decoy, though it proved quite effective. Many of the Orks' starships rushed to prevent the attacks on the outer planets, leaving the central world dangerously vulnerable and exposed to the waiting main body of the Imperial forces, led by the Astartes of the Luna Wolves Legion. The Luna Wolves' Legion fleet headed straight for this central world and more specifically for Urlakk's fortress-palace. At the height of the campaign, Horus and his Terminator-armoured elite Justaerin successfully confronted the Overlord and his retinue of Nobz. With the death of its leader, the Ork forces collapsed into infighting as was their wont and the battle for Ullanor soon became a massacre. The remainder of the Ullanor Sector was subdued by the forces of the Crusade and returned to Imperial rule within the year, as the Ork empire had completely fragmented upon hearing of its master's death once the various Nobz declared themselves the new Warlords and fought each other for control. With Urg's termination, the nascent Ork empire self-destructed, and the xenos that were not hounded into the mud of Ullanor's vast battlegrounds would be hunted down across hundreds of star systems, all the way to Chondax, the Kayvas Belt and beyond. Following this monumental victory, the Triumph of Ullanor was held, a massive Imperial gathering that payed homage to the monumental victory achieved by its commander Horus Lupercal. Here the favoured son of the Emperor was invested with the newly created title of Imperial Warmaster, supreme commander of all the Imperium's military forces. The Emperor also announced that He would be stepping down as the Great Crusade's direct military commander and returning to Terra to undertake an important project. He passed on the mantle of leadership of His military forces to the newly invested Warmaster. When the Great Crusade commenced again, it now had a Warmaster at its apex, not an Emperor.Chondax Campaign (000-007.M31) - Shortly after the Triumph of Ullanor, Jaghatai Khan and his Vth Legion were next sent to the worlds of the Chondax System. The system was comprised of the planets Epihelikon, Teras, Honderal, Laerteax and Phemus IV, the furthest of the outlying worlds. The culmination of this campaign took place upon the world of Chondax, labeled Chondax Primus EX5, 776 NC-X-S by Imperial cartographers, but named "The White World" by the White Scars due to its salt-like earth. The White World was the crucible of the whole campaign, the heart of those Greenskin forces that had chosen to go to ground in the system. The Khan was ordered by the newly-promoted Warmaster Horus to hunt the remnants of the Ork empire destroyed on Ullanor, the last slivers of the Warlord Urlakk Urruk's Greenskins. Perhaps some would have balked at such a campaign, for it was not prestigious work, but the Khan was happy enough. It was hunting, and in a way that he understood: cavalry charges across open spaces, going up against prey that had no concept of capitulation or self-pity. He had never complained. Nearly all of his Legion went with him, ranked in their various brotherhoods, eager for the hunt. Scores of white starships cut the void, each crammed with warriors of the ordu, all desperate to get back in the chase. The brutal campaign lasted six long standard years as the White Scars hunted the remaining Greenskin forces to extinction. It was at Chondax that the White Scars would first learn of the outbreak of the Horus Heresy and the betrayal of Horus Lupercal. Delayed by the arrival of the fleet of the Alpha Legion, the White Scars would break-out from the Traitors' cordon and begin the long journey back to Terra in search of answers -- leaving multiple Alpha Legion warships as flaming wreckage in the bargain. The White Scars soon learned of the Warmaster's heresy when they established contact with Leman Russ in the aftermath of the Space Wolves' destruction of Prospero. Faced with the dilemma of aiding the weakened Space Wolves against a powerful force of Alpha Legion attackers, or returning to Terra as ordered by Rogal Dorn, Jaghatai Khan choose to go to Prospero to seek out the truth of the Heresy for himself. Satisfied, he eventually did his duty and returns to Terra.Second Battle of Paramar (008 or 011.M31) - Ground assault units of the White Scars participate in the failed Loyalist attempt to retake the strategically vital world of Paramar V from Horus' Traitors.Siege of Terra (014.M31) - The White Scars were one of only three Loyalist Space Marine Legions present at the Battle of Terra during the defence of the Emperor's Imperial Palace, alongside the Blood Angels and the Imperial Fists. Before the final defence of the Imperial Palace began, the White Scars launched a counterattack to break through the encircling siege of the Traitor Legions of Horus. As part of this counteroffensive, the White Scars undertook a daring lightning raid to seize the Lion's Gate Spaceport from the enemy's hands. This enabled the Loyalists defending the Palace to receive fresh troops and supplies from orbit and boosted the morale of the Palace's defenders. A similar Loyalist assault on the second major starport near the Palace failed, largely due to the lack of the White Scars' expertise in mobile warfare. However, the White Scars did not participate in the Emperor of Mankind's final teleport assault upon Horus' flagship, the battle barge Vengeful Spirit.