999.M30 World-Prince Campaign - This was one of the final campaigns fought by the Imperial Fists during the waning years of the Great Crusade upon an unnamed Hive World against a non-Compliant human civilisation ruled over by a monarch known as the World-Prince. Initially, the World-Prince had refused to surrender to the Imperium and stubbornly resisted the efforts of the Imperial Fists led by Rogal Dorn himself. The Imperial Fists systematically fought one hive city at time, and were making slow but steady progress, until the Alpha Legion arrived unexpectedly. Informing their fellow Legion that they were there as allies in the campaign, the Alpha Legion immediately began to begin operations against the intransigent world. Though no Alpha Legion warriors were encountered by the Imperial Fists during the campaign on the ground, the signature of their presence was abundantly clear, as soon, uprisings and coups began to erupt across the remaining hives, which threw the beleaguered world into absolute anarchy. Following the death of over 400 members of the World-Prince's nobility, he capitulated to Dorn. Enraged, Rogal Dorn confronted Alpharius and scorned him for his disreputable way of waging war. He then ordered the Alpha Legion to cease all operations and leave the planet. In one final act of spite, Dorn proceeded to lay out the Alpha Legion's entire plan, and poked holes in its overall effectiveness, before walking away in disgust.
ca. 999.M30 Compliance of 670-25 (Nurth) - The Alpha Legion responds to requests for aid from the 670th Expeditionary Fleet to take part in the Imperial Compliance of the world of Nurth. Unfortunately, the planet is lost when a Chaos-tainted local military force, known as the Echvehnurth, activated a Warp-tainted artefact called a Black Cube as a last act of defiance. Once activated, Nurth was transformed into a world inimical to all sentient life nearly overnight, killing most of the Imperial forces on the ground.
000.M30 Alpha Legion Makes Contact with the Cabal - According to the Unbalanced Scales, this year marks the beginning of the Alpha Legion's compact with the xenos faction known as the Cabal.
ca. 000.M30 The Ullanor Crusade - The Ullanor Crusade was a vast Imperial assault on the Ork Empire of the Overlord Urrlak Urruk on the world of Ullanor Prime, the largest such Greenskin empire ever encountered in Mankind's history to that time. The Crusade included the deployment of 100,000 Space Marines, 8,000,000 Imperial Army troops, a Titan Legion and thousands of Imperial starships and their support personnel. The Ullanor Crusade marked the high point of the Great Crusade's vast effort to reunite the scattered colony worlds of Humanity across the galaxy.
000.M30 Triumph of Ullanor - Following the defeat of the Orks of Ullanor, the Emperor finally left the Great Crusade behind and returned to Terra to begin work on His vast, secret project to open up the Aeldari Webway for Mankind's use beneath the Imperial Palace. In His place to command the vast forces of the Great Crusade He left the Primarch Horus Lupercal, his most-favoured son, whom He raised to the newly-created rank of Imperial Warmaster. Horus received command authority over all of his fellow primarchs and every expeditionary fleet of the Great Crusade.