803.M30 Discovery of Paramar System - This unusual trinary star system, which possesses vast mineral wealth amid its thirty-seven recorded main satellites, was identified and entered into the Carta Imperialis by the Rogue Trader Hel DeAniasie in 803.M30. Being located in an unusually stable Warp-synchronous location in realspace, the Paramar System quickly became a way point for the Imperium's initial expansion into the Segmentum Obscurus.
Unknown Date.M30 The Hunting of the Ak'Haireth - An alien menace known as the Ak'Haireth or "Bone Drinkers" were initially encountered in the early years of the Great Crusade in the western reaches of the Segmentum Solar. These fungoid, predatory and parasitic life forms were fuelled by the slow and agonisingly painful siphoning of nutrition from living animals, primarily human bone marrow. They inhabited the scavenged void ships of other starfaring species and raided isolated colonies and Feral Worlds unable to resist their predations. They were subjected to extermination pogroms carried out both by the Luna Wolves and the VIII Legion (not then yet formally known as the Night Lords) which were thought to have been successful.
ca. 805.M30 Siege of Reillis - The Emperor and Horus Lupercal fought together on many occasion during the early years of the Great Crusade. At the fortified city of Reillis, a human settlement unwilling to accept the Emperor's Imperial Truth, the defending army used secret tunnels to infiltrate behind the besieging Imperial Army and hundreds of shock troops swamped the Imperial's command encampment. Unprepared and unarmoured, the Emperor and Horus fought back to back until a plasma blast stunned the young Primarch and sent him staggering to the ground. The Emperor stood over His son and refused to give ground until reinforcements arrived to drive their attackers back.
ca. 806.M30 - The Gorro Hollowing - Within the Telon Reach was an Ork empire that rivalled that later centred on Ullanor, and at its heart was the scrap world of Gorro. Capable of generating destructive yields of terrifying potency, the Emperor decreed that Gorro must be destroyed. Leading the assault Himself, the Emperor and his dutiful and favoured son Horus, at his side, teleported into the subterranean tunnel network deep within the strata of the scrap planet. As the Space Marines attacked, the Ork resistance they faced was nearly overwhelming. At the height of the battle, the Emperor was split from the rest of His forces, and came face-to-face with an Ork of monstrous size, larger than any encountered by Mankind in its long history, who snatched the Emperor from the ground in its massive bionic claw. As the creature's grasp closed to throttle the Master of Mankind, Horus stormed through the press of battle and cut the Ork's arms from its body with a single blow. Together, father and son led their forces deeper into the vast sphere of scrap until they reached the centre of Gorro, and caused the scrap world to implode upon itself after they sabotaged its self-sustaining Warp-fold envelope.
806.M30 Compliance of the Osiris Cluster - In the eighth standard year of the Great Crusade, the Expeditionary Fleet of the XIII Legion discovered the Osiris Cluster, a grouping of eleven star systems that made up the inner portion of the Segmentum Solar's second quadrant. The inhabited worlds of this region, many technologically advanced at contact, were brought into Imperial Compliance in relatively bloodless order. It was viewed as a highly successful campaign in which the XIII Legion themselves had a major hand.
807.M30 Compliance of 02-34 (Rust) - The third large-scale engagement of the X Legion -- the invasion of the planet designated 02-34 (or the "Battle of Rust" as it would be commonly known to Imperial military historians) -- showed the X Legion's particular martial gifts for what they were, and would do so with empathic force. Planet 02-34, or "Rust" to give its colloquial name, was an arid-waste world, rich in pyro-chemical deposits, oxide deserts and the corroded remnants of vast, long-dead cities. The Orks of the powerful and expanding "Krooked-Klaw" empire of Wardog Kulo spanned more than sixty inhabited star systems to the galactic northeast of Seraphina, making Rust a slave-mining colony comprising millions of Orks and a vast, shifting population of short-lived human slaves harvested in interstellar raids. Scouted out by Rogue Trader Hedrik Zuckerman and identified as a primary target of the early Great Crusade, it was into this alien domain that the combined forces of the Space Marine Legions, with the Emperor at their head as part of the primary Principia Imperialis Expeditionary Fleet pf the early Crusade, slammed with devastating force in 807.M30 into what was, at that early stage, the most widespread mass offensive of the Imperium. Under the generalship of their then-Legion commander, Lord Commander Amadeus DuCaine, the X Legion formulated a plan of attack which owed much to the feared and pitiless battle-craft of Old Albia; a tactic known as "the Hammer and the Storm." After many solar days of continuous fighting, though they had not lost the will to fight, the Orks of Rust simply ran out of blood and machinery to spend. At the end of the battle, the X Legion had suffered less than a fifth of its number in fatalities; a far lower figure than might have been expected. Rust was hailed as a great Imperial triumph on account of how little had been sacrificed to attain it.
ca. 800s.M30 War in the Shedim Drifts - During the war in the Shedim Drifts against the marauding Aeldari of Craftworld Mór-ríoh'i, a vast Imperial force comprised of no less than four Titan Legions was assembled and placed under the overall command of Commander Horus Lupercal and his Luna Wolves Legion. The apocalyptic battle which raged upon the planet's surface saw a full demi-Legio of the Legio Atarus encircled and all but destroyed. The Lupercal had cruelly used them, without their foreknowledge or consent, as a ruse to divert the strength of the enemy away from the direct defence of their Craftworld while his Legion undertook a surprise assault against it. The war of the Shedim Drifts was a great victory for Horus and all those of the Imperium who fought in the campaign gained glory because of it, but at the expense of the Legio Atarus, an injury that the Firebrands would not forget -- or forgive. 813.M30 Mezoa joins the Imperium - Mezoa was founded first as an outpost of the Lucien Mechanicum in 540.M30 before the Great Crusade. It then rapidly gained status as an independent Forge World in its own right in 813.M30. This war-world was dedicated solely to the production of heavy arms and armour. The Mezoan forges were built under the direction not only of the Archimandrites of the Cult Mechanicus, but also the minds of both the Emperor and, it was said, the Primarch Ferrus Manus in later years after he joined the Imperium.
819.M30 Discovery of Leman Russ - The Emperor travels to the frigid Death World of Fenris to meet Leman Russ, who challenges him to three contests: eating, drinking, and fighting. Although the primarch wins the first two, Leman Russ is humbled in the third and swears loyalty to the Emperor, who grants him command of the VI Legion -- soon to be known as the Space Wolves.
821.M30 Discovery of [REDACTED] - Records expunged.
824.M31 Discovery of Ferrus Manus - The Primarch Ferrus Manus spends his youth slaying machine-monsters and plundering the buried secrets of Medusa, his frozen homeworld. As overlord of Medusa's rival techno-clans, Ferrus joins the Great Crusade after a cataclysmic meeting with the Emperor -- taking command of the X Legion, which he renames the Iron Hands.
824.M30 Contact with Lethe - Lethe was first contacted in 824.M30 by the Rogue Trader Vaspperly Elgin, ahead of the Great Crusade's advance in force into the Coronid Deeps region some standard years later. Used as an early staging point by Crusade fleets, Lethe later served its part within the Imperial fold, providing several elite pioneer light infantry cohorts for the Imperialis Auxilia.
ca. 829.M30 Proximan Rebellion - The Proximan Rebellion is one of the earliest recorded engagements of the as-yet unnamed III Legion. Assigned to the Imperial Compliance ceremonies and as the Emperor's honour guard for Proxima's formal accession into the Imperium, an insurrectionist trap was sprung which resulted in the III Legion's XVIth Cohort (Chapter) fighting and dying to the last warrior alongside the Legio Custodes, never giving ground during the insurrectionist surprise attack on that world's ceremonial plaza. By their sacrifice was the wounded Emperor, who had suffered injury through the use of a Vortex Weapon by the enemy, bought time to recover and fight His way clear of the Proximan insurrectionists' trap. In recognition of this sacrifice, the standard of the Palatine Aquila so fiercely fought for that day was given to the Legionaries of the III Legion by the Emperor's own hand, to be their relic ever after, along with the right to end the Proximan revolt by Exterminatus and so repay the blood that was owed them. Until after the Horus Heresy, only the III Legion bore the right and the honour to emblazon their armour with the Aquila, a right that made their ultimate betrayal all the more painful for the Master of Mankind.