ca. 900s.M30 The Carinae Retribution - The conquest of the Carinae Sodality remains a black mark on the record of the Raven Guard, a campaign whose details, long suppressed by factions within the Officio Militaris, show the Raven Guard as directly responsible for the campaign's delay and the excessive casualties recorded by the Imperial Army units assigned to the fighting. The Raven Guard were assigned to pacify the "Thousand Moons of Carinae" -- immense void-cities that circled the otherwise planet-less primary. On one such moon, designated Zenith-312, the cities' Arch-Comptroller unleashed a terrible weapon -- an anima-phage of terrible potency that rendered men into creatures of rage and hunger, bereft of all reason and memory. The Raven Guard suffered little ill-effect due to their genetically-enhanced immune systems, but the ordinary citizens of Zenith-312 and the mortal soldiers of the Imperial Army were reduced to a frothing, mindless horde that numbered in the tens of thousands. Immediately, the Raven Guard found themselves beset on all sides, and were forced to put down those who they once called allies, granting them the mercy of death. In revenge, Corax hunted down the escaped Arch-Comptroller, and enacted a brutal and long, drawn-out death. But in their need for revenge, the Raven Guard were neglectful in their duty, allowing for the other moons to fortify themselves, drawing out what was supposed to be a relatively swift Imperial Compliance action for seven long solar months, costing thousands of Imperial lives in the process.
ca. 900s.M30 The Fall of the Lords of Gardinaal - The Gardinaal was a stellar empire comprised of eleven inhabited worlds encountered at the edge of the Dominion of Storms to the galactic east. They were an empire who possessed a considerable might of arms, enough to give even the Expeditionary Fleets of the Great Crusade pause. When an honour guard of Thousands Sons were sent to meet with the lords of Gardinaal, at first the negotiations went well, but unfortunately, the Thousand Sons were able to detect a psychic attempt to subvert the Imperial emissaries. The nearby Ultramarines 413th Expeditionary Fleet, commanded by Master Ulan Cicerus of the XV Chapter, was forced to intervene militarily. But soon their gains were forestalled by the superior defences of Gardinaal Prime, which proved disastrous, as they utilised powerful STC-based weaponry and vehicles never encountered by the Imperials before. A blockade of the Gardinaal System was employed. The stalemate was soon broken by a new war-host led by the Iron Hands and the Emperor's Children Legions. The Emperor's Children contingent launched a diversionary attack, while the Iron Hands led a relentless and tireless assault spread over every world. The Ultramarines requested to lead the assault on the capital city to restore some of their lost honour, though the blood price they paid was steep. The Iron Hands fleet left the Gardinaal System shortly afterwards, its other inhabited worlds pleased to surrender unconditionally to the Imperium's mercy. Though initially faced with famine and hardship, Gardinaal soon proved a valuable addition to the Imperium and a model of Imperial Compliance.
ca. 900s.M30 Defence of Necromunda - At some unknown date later in the Great Crusade, the Imperial Fists Legion won a major victory against the Orks upon the ash wastes of the Hive World of Necromunda. The Hive Lords consented to new Imperial Fists recruits being drawn from their population in gratitude and a fortress-chapel was duly consecrated, but the Imperial Fists continued to refuse to accept any special political or economic rights on the worlds where their Legion recruited. Throughout the Great Crusade, they refused to garrison or claim tithes of newly conquered worlds, instead opting to remain a military unit with none of the other responsibilities that came with ruling a single homeworld and caring for its mortal population.
ca. 900s.M30 Krypt Persecution - The Compliance of Krypt was a relatively short campaign conducted during the Great Crusade by both the Death Guard and the Luna Wolves Legions against the Orks upon the frozen plains of the world of Krypt. Fighting together for more than a solar week across the frozen surface of the planet, the Legiones Astartes turned the blue ice dark with xenos blood. Battle-Captain Nathaniel Garro and his 7th Great Company were known to have fought alongside the Luna Wolves' Captain Garviel Loken and his 10th Company during this action.
ca. 900s.M30 Battle of Gyros-Thravian - The Battle of Gyros-Thravian was a massive joint-Imperial Compliance action carried out by three Space Marine Legions, composed of the Luna Wolves, Death Guard and Imperial Fists against the extremely powerful Ork Warboss Gharkul Blackfang, one of the most powerful Ork Warlords ever encountered up until that time. Despite the strength arrayed against the Greenskin, it was the Imperial forces who were soon on the verge of defeat. It was then that the Emperor Himself, aboard his flagship Bucephelus, came to the aid of His sons with his Principia Imperialis fleet. He personally led a force composed of 1,000 Legio Custodes into the heart of the mighty Ork horde. Blackfang was confronted by the Emperor and killed atop his Gargant while the Custodians proceeded to lay waste to the rest of the Greenskin horde. The Custodians accounted for the slaughter of the Orks, slaying over 100,000 of the savage xenos, with the loss of only three Custodians. Following their momentous victory, the Emperor commemorated the Custodians' sacrifice by engraving the names of the three fallen into his own personal Artificer Armour.
954.M30 The Screaming World - The Ultramarines Legion is drawn to the world of Volturn, thought to already be Compliant, by the petitioning of the Legion's Librarians, who claim to hear inhuman screaming emanating from its location. Upon investigation, the world is found to be infested by ill-definable xenos creatures. Volturn is quarantined and abandoned after all members of the landing party suffer spontaneous and fatal cerebral aneurysms within solar minutes of setting foot upon the damned, screaming world.
ca. 957.M30 The Melkeji Salvation - The world of Melkeji was a planet on the trailing edge of the galactic rim which had retained many of the technological marvels of Mankind's Dark Age of Technology. Unfortunately, the human population was enthralled to nameless parasitic xenos creatures that ruled Melkeji through a class referred to as "the Ascended." Knowing that they could not capture the planet, the Grand Marshal of the Expeditionary Fleet sent an Astropathic message asking for aid. Lorgar himself came to Melkeji with eight full Chapters of his XVII Legion and the aid of the Imperial Army. Through Lorgar's tactical genius and superb guile, he overwhelmingly defeated the xenos. The people of Melkeji knew that their masters were gone and that they were facing a power greater and more terrible than any they could have dreamed in their wildest nightmares. Most of the Melkeji surrendered at that moment, the rest a few solar days later. A solar decade after, Melkeji was a world faithful to the God-Emperor. Nearly a solar decade after that, half a million of its sons and daughters would come to Ultramar in 007.M31 with the names of alien gods on their lips and aid the Word Bearers in the assault upon Calth as Chaos Cultists.
962.M30 Pacification of the Saryine Compact - The Iron Warriors' 282nd Grand Battalion successfully conducted the Pacification of the Saryine Compact, reducing rebellious garrison forces to 30% effective strength. The 282nd Grand Battalion suffered only 32% casualties, which lead the Battalion command to be censured by the Iron Warriors High Command for its lack of zeal.
962.M30 The Defence of Helioret - The insane Witch Idol of the Aeldari Craftworld of Magc'Sithraal led a brutal campaign of raids against the world of Helioret, perpetrating etheric outrages across the sector. The combined forces of the Blood Angels and the Ordo Sinister bring down the Witch-Idol and cast the Craftworld into the local star.
964.M30 The Razing of Monarchia - Monarchia was the name of the capital city of the planet Khur, built as a beautiful shrine to the God-Emperor by the XVII Legion, the Word Bearers, during the Great Crusade. Monarchia, along with its false temples dedicated to the divinity of the Emperor in direct contravention of the official atheism of the Imperial Truth, was destroyed by the warriors of the Ultramarines Legion as an object lesson in the folly of false religion. The entirety of the XVII Legion was then forced to kneel in the ashes of their devotion by the psychic might of the Emperor Himself, while the Ultramarines stood over them in judgement -- that which they had seen as worthy devotion now labelled treasonous. Suffering such a humiliating rebuke at the hands of the Ultramarines, this insult would apparently fester within the XVII Legion and drive them willingly into heresy and the service of the Ruinous Powers -- gods worthy of their need to believe.