984.M30 The Destruction of Nostramo - The destruction of Nostramo was an Exterminatus action conducted by the now-rogue Night Lords Legion after the Night Haunter's attack on Rogal Dorn towards the end of the Great Crusade, following the pacification of Cheraut. The VIII Legion willingly destroyed their own homeworld of Nostramo on the order of their Primarch, concentrating deadly Lance-strikes on the planet's unstable core, which resulted in tumultuous seismic activity that eventually ripped the dark planet apart in a wave of destruction. This event fulfilled the Night Haunter's vision of seeing his planet being destroyed by beams of white light that erupted from the heavens. For this crime, Curze was eventually recalled to Terra by the Emperor to be reprimanded for his brutal tactics, but instead he would join the Warmaster Horus in open rebellion during the Horus Heresy before he could ever stand before his father.
987.M30 The Compliance of Indra-sul - On the world of Indra-sul, the Raven Guard infiltrate the home of the monstrous xenos Khrave and wage a guerilla campaign to defeat the gluttonous, warped creatures within, in their efforts to liberate the human population the Khrave dominate. The Khrave and their edifice are cast down, freeing Indra-sul.
988.M30 The Mariposa Campaign - A pocket of space comprising 12 sub-sectors is released from a Warp Storm which had raged from the time of the Age of Strife. For three Terran years, the Blood Angels, Imperial Fists, Imperial Army and Sisters of Silence battle against hordes of Warp-twisted cults of the mutant and the psyker, brining 34 new worlds into Imperial Compliance.
989.M30 Hunting of the Ak'Haireth - In 986.M30, reports of attacks against isolated outposts and shipping in the region of the stellar wastes near Olmec indicated that the Ak'Haireth -- a fungoid parasitic lifeform whose sentience was only acquired from operating as psychically interwoven gestalt blooms, and whose existence was fueled by a the slow and agonisingly painful siphoning of nutrition from living animals -- were again dangerously growing in strength and number. The Alpha Legion were assigned the xenocide of the species before it could spread further. Within three sidereal years, they accomplished this feat by working in conjunction with the Magi Biologis and creating a deadly, genetically-targeted bio-weapon that poisoned the source of the Bone Drinkers' nourishment -- the humans that lived on the worlds and plied the stars near Olmec. The malignancy of the virus caused those Ak'Haireth that fed on the targeted populations to fall ill and die -- at the cost of also killing 7% of those humans who had been infected with the virus. But the Ak'Haireth species had been caught unawares and was finally driven to extinction.
ca. 990.M30 Xenocide of the Khrave - Corax and his Raven Guard Legion were deployed in the far galactic north, pressing the Great Crusade's expansion past the reaches of the Segmentum Obscurus, when they discovered the world of Indra-sûl, and the greatest Khrave dominion encountered so far in Imperial history. The Khrave were a dangerous species of psychically-gifted xenos that preyed on human worlds, enslaving entire populations to feast on them and thus strengthening themselves. After a protracted and bloody campaign, Corax successfully wiped out the Khrave and liberated Indra-sûl from their xenos masters. Unknown to the Raven Guard, the Iterators and other Imperial servants following on the heels of the XIX Legion's advance would later condemn the survivors to a living death as lobotomised Servitor labourers, seeing them as corrupted in both mind and body.
Mid-900s.M30 Siege of Barrakan - This was an Imperial Compliance action carried out by the Dark Angels during the Great Crusade against the Orks on the world of Barrakan. A notable campaign of this Compliance action was the defence of Firebase Endriago. A Chapter of the Dark Angels had been cut off by the Greenskins and trapped at the firebase for 18 solar months. By the end, the beleaguered Astartes were fighting off the alien assaults with fists and pieces of sharpened steel scavenged from bombed-out strongpoints, but through it all, Brother Nemiel had never wavered. He had taunted the Greenskins relentlessly and exhorted his brothers to acts of ever-greater defiance in the face of insurmountable odds. When a Greenskin's crude axe had shattered his knee, he had grabbed the beast by one of its tusks and kicked it to death just for spite. When the last line of defence was broken, he had stood his ground in the face of a massive xenos champion and fought an epic duel that had given the Chapter time to launch a counterattack that finally exhausted the last of the enemy's strength. The next day, when relief forces finally managed to fight their way through to the firebase, Nemiel had stood on the ramparts and cheered with the rest of his brothers. It took several solar minutes before he registered the slaps on his shoulders and back and realised that the Chapter was not cheering for victory -- they were cheering for him. Not long after, the Chapter voted unanimously for him to take the place of Brother-Redemptor Barthiel, who had fallen during the darkest hours of the siege.
994.M30 Istvaan System first brought to Imperial Compliance - One of the more notable campaigns carried out by Primarch Corvus Corax and his Raven Guard Legion during the Great Crusade was the Imperial Compliance of the Istvaan System in 994.M30, located in the northern reaches of Segmentum Ultima. The Istvaan System had required force to impose Compliance, so an outlander was chosen rather than a local to rule, and this task was given to Vardus Praal, formerly a Major of the XIth Lastran Rifles of the Imperial Army and later a career politician of the Ultima Segmentum Court.
ca. 995.M30 Pacification of the Hith System - Approximately a solar decade prior to the events of the Istvaan III Atrocity, the pacification of the Hith System against the Orks of Charhack was the largest concentration of Imperial military force ever seen to that time, omprising well over 200,000 Space Marines, although exact figures could not be corroborated. These Legiones Astartes fought alongside Titan support from the Legios Mortis, Audax and Vulpa and a number of auxiliary units.
ca. 997.M30 Subjugation of Kernunnos - The Space Wolves' 954th Expeditionary Fleet, comprised of the Space Wolves 13th Company under Wolf Lord Bulveye, successfully completes the conquest of the non-Compliant human world of Kernunnos.
998.M30-005.M31 Suppression of the Gordian League - The Dark Angels fought this Compliance campaign against the Gordian League -- a confederation of human worlds who were allied with degenerate xenos. The Dark Angels were still bogged down during this campaign in 005.M31, when they received word of Horus' treachery at Istvaan III, as well as the secession of the World Eaters, Emperor's Children and the Death Guard Legions. Jonson believed that the Dark Angels' deployment to the Shield Worlds was part of an effort to scatter the Imperium's most loyal servants as far as possible in order to minimise the number of Loyalist Legions Horus would have to face at any given time. Jonson's forces were too deeply enmeshed in the Shield Worlds to respond quickly to Horus' treachery; the best estimates of the Primarch's staff indicated that it would take them nearly eight solar months to conclude their offensive operations, even on an emergency basis, and reposition themselves for a strike against Istvaan V. The Primarch issued orders for many of their reserve squadrons to resupply and prepare for immediate deployment to the Tanagra System. Their primary target was to secure the Forge World of Diamat. They could not afford to let the Warmaster acquire the substantial supplies and ordnance needed to fortify the world of Istvaan V against the approaching Loyalist strike force. Jonson personally lead the expedition to Diamat, with a battle group of fifteen warships.
ca. 999.M30 Compliance of Melchior - The Imperial Compliance of Melchior was a joint campaign that was carried out by both the Luna Wolves and the Blood Angels Legions. The world was the last bastion of the xenos known as the "Nephilim" -- a parasitic alien race that slowly fed on humans and had claimed a hundred worlds before they had come to rest upon Melchior. Even their name, the Nephilim, the name of the fallen seraphs, was a name taken from ancient human mythology. The Luna Wolves and Blood Angels stood shoulder-to-shoulder and brought their full, unfettered wrath down upon the upstart xenos. Caught between the brutal fury of two Space Marine Legions on Melchior's shining sands, the Nephilim were finally put to the sword.
ca. 999.M30 Pacification of Aghoru - The Aghoru Campaign was an Imperial Compliance action carried out by the then-loyal Thousand Sons and a small contingent of the Space Wolves Legion in the waning years of the Great Crusade. Though Imperial Compliance was successfully accomplished through diplomacy and considered a success, soon notable combat actions took place between the Thousand Sons and an apparent Warp denizen infestation of beings known to the local population as "Elohim" within the subterranean passages of the vast artificial peak known as "The Mountain." The Space Wolves helped to put down this infestation.