Legio Tempestus - Notable Campaigns: Epsiloid Binary Cluster Campaign (Unknown Date.M31) - A campaign conducted by the Legio Tempestus alongside Primarch Roboute Guilliman's forces during the Great Crusade against the Orks. The Legio suffered the loss of 6 Titans in the course of fighting, as well as many wounded, including the already battle-scarred Victorix Magna, the towering war machine of The Stormlord himself. Because of the injuries his war engine sustained, Princeps Senioris Cavalerio was forced to return to Mars for repairs, leaving the bulk of his Titan Legion under the command of Princeps Maximus Karania.Schism of Mars (005-006.M31) - When the civil war broke out on Mars, the Legio Tempestus supported the Loyalist Mechanicum forces during the opening days of the Horus Heresy, defying the traitorous Fabricator-General Kelbor-Hal and his Dark Mechanicum. They fought a major engagement at the Loyalist forge known as Magma City against their bitter rivals, the Traitor Legio Mortis. The Stormlord valiantly led his Legio in the destruction of the Death's Heads' lesser war machines, only to face his own destruction, along with the remainder of his war engines, at the hands of the Traitor Imperator-class Titan Aquila Ignis.Battle of Manachea (ca. 008.M31) - The Battle of Manachea was an early campaign conducted by the Traitor forces of the Warmaster Horus against the Manachean Commonwealth, an independent dominion formed as a self-governing sub-sector within the Cyclops Cluster. Considered the lynchpin of the Coronid Deeps, it was also the principal axis of Imperial power based in the northern Imperium. The two systems of Manachea -- principally the Hive World of Manachea Vysidae, which in terms of population and industry the equal of any of the great hive worlds of the Segmentum Solar, and Port Maw which, while still under partial construction and expansion, were one of the most powerful Imperialis Armada bases in the northern Imperium. With the help of the Black Magos of the Dark Mechanicum Forge World of Cyclothrathe, the had secretly undermined the defences of the Manachean Commonwealth. In a surprise attack, the Death Guard Legion, alongside Traitoris Perdita elements of the Legio Tempestus, attacked Manachea, while the Sons of Horus launched a dual-pronged attack -- a speartip assault on Port Maw and a simultaneous assault alongside their Death Guard allies on Manachea. Within a span of eleven days of brutal fighting, Manachea and everything on it, belonged to the Warmaster.Imperial Muster at Beta-Garmon (012-013.31) - For reasons only understood later in the war, the Ruinstorm that had been invoked by Lorgar, primarch of the Word Bearers, several standard years earlier during the Battle of Calth, began to abate across vast swathes of the galaxy. Loyalist high commanders were able to utilise the potent astropathic relay at Beta-Garmon to contact and recall formerly lost or stranded forces from across the war-torn reaches of the northern Imperium. The Imperial Muster at Beta-Garmon rapidly escalated into the largest gathering of Loyalist might since the early years of the war, a concentration of forces so mighty that the Traitors had to respond in kind. The resulting clash of arms would become known as the "Great Slaughter," a theatre of war of such scale that it would encompass the "Titandeath" and the Sea of Fire campaigns, each major campaigns in their own right. By its end, both sides were so badly bled that their only remaining option for ultimate victory was to force a final, decisive confrontation. As history related, the final battle would be fought at Terra, but only after the weighty butcher's bill of the Great Slaughter was paid in full.Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - The Legio Tempestus took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, the Legio Tempestus was supported by the Knights of House Malinax and House Turbidos. Even before the greater armies of the Warmaster Horus reached the star cluster, the battle lines had long since been drawn, and fighting had been going on for many Terran years. It was a cauldron of battle that would consume millions of lives before its end and see the demise of entire Titan Legions, earning this campaign the dire moniker of the "Titandeath." The Beta-Garmon Cluster, also known as the gateway to the throneworld of Terra, was the last hurdle that the Warmaster Horus' forces had to overcome before they reached the Imperium's capital world. Heavily fortified by the Loyalists, Beta-Garmon would become one of the greatest and bloodiest battles of the Horus Heresy, as well as one of the longest-lasting.Siege of Terra (014.M41) - The Siege of Terra was the final battle of the Horus Heresy waged upon the surface of the Imperial Throneworld itself against the overwhelming forces of the Warmaster Horus. The Legio Tempestus were one of several Titan Legions that took part in the intense fighting that determined the fate of the Imperium of Man and all of Humanity.Second Aegisine Crusade (633.M39) - The Second Aeginsine Crusade was launched by the Imperium of Man to reclaim the worlds of the dread Sub-sector Mandragora in 633.M39 after it had lost contact with the Imperium for centuries under a pall of Warp Storms. The Red Scorpions Space Marine Chapter gained high honour for their role in the later phases of the Imperial Crusade which re-conquered the worlds around the former Sub-sector capital world of Hecuba. These worlds had fallen under the tyranny of a heretical sect of the Adeptus Mechanicus based on the once-proud Forge World of Shaehol. Its defences were thought to be impenetrable, and the Crusade's command elements feared that it might be impossible to retake without the use of orbital bombardment -- an alternative that might render many of the planet's assets irrecoverable. The Red Scorpions volunteered to make the initial insertion via a concerted Drop Pod attack, which was later supported by Thunderhawk gunships. In short order, the Space Marines established a beachhead against nigh-overwhelming resistance. Over the course of nearly twenty-four solar hours, the Battle-Brothers fought wave after wave of corrupted Mechanicus forces, granting the Battle Titans of the Legio Tempestus an opportunity to land and deploy their forces. Without the Space Marines' sacrifices, the Collegia Titanica forces would have suffered unacceptable losses in the course of their insertion. Over the next two standard years, the Red Scorpions Chapter fought side by side with the other members of the Crusade, eventually cleansing the world of its traitorous infestation and liberating its manufactoria so that they could once more support the Crusade's efforts. When at last the conquest was over and the Red Scorpions took their leave of the planet, the Mechanicus lords of war did them homage, as towering Imperial Knights and Titans lined the route taken by the Red Scorpions as they marched to the landing zones, bowing to them in homage as they passed by.Sabbat Worlds Crusade - Defence of Orestes (779.M41) - The homeworld of the Legio Tempestus, the Forge World of Orestes, was invaded by a large force of Traitor Titans during the Sabbat Worlds Crusade, to which the world had contributed much war materiel and for which it was a vital source of supply by virtue of its close proximity to the theatre. The Crusade Warmaster's constant requests for materiel and the support of the Legio Tempestus had drained the world of resources and left it weak -- rendering it a perfect target for Archon Urlock Gaur, the commander of the Forces of Chaos in the sector. The Dark Mechanicum in the Archenemy's service blinded the planet's sensors and allowed bulk landers to set down in the Astrobleme region and disgorge their engines of war. As a result of the Forge World's having met the Warmaster's demands, the Legio Tempestus had been left with only a token force of twenty-two Titans to defend its homeworld -- nowhere near enough to face an enemy Titan force seven times this size. The Legio Tempestus was unable to cover ground and found itself outnumbered, outgunned and outmaneuvered at nearly every turn, losing eight Titans in the first days of fighting. Orestes escaped swift and inevitable destruction only thanks to the arrival of the Legio Invicta, which was passing near the planet on its way to the Sabbat front. The bulk of the Legio Invicta landed in Orestes Principal, and after three days of preparation, it moved out into the Jeromihah Subsidiary and adjacent areas, engaging the forces of the Archenemy on Orestes for the first time. The Legion's efforts bore fruit, as its forces scored many Titan kills with few losses of their own, eventually causing the Traitors to converge on the ruins of Hive Argentum in hopes of drawing the two Imperial Titan Legions to full-scale battle -- a challenge which the Legio Invicta Princeps Maximus Pietor Gearhart, against the advice of a number of his senior princeps, accepted, also wishing to wipe out the enemy. In the meantime, the Orestean Analyticae Department, at the behest of the Legio Invicta, had been reviewing pict scans of Traitor war engines in order to discover their original identities as Adeptus Mechanicus Titans, and by extension any weaknesses and construction flaws they might exhibit. To this end, the Orestean Magi opened sequestered archives, containing materials pertaining to the Horus Heresy and the times before the founding of the Imperium. Amongst these, a document proving beyond the shadow of a doubt that the Emperor of Mankind was not the Omnissiah was discovered, and leaked out of the Analyticae offices. Such revelation confirmed the beliefs of the Mechanicus of Orestes and many other Forge Worlds, and caused outrage amongst the Imperial populace of the Forge World. In the ensuing chaos, a triumvirate of conspirators -- Legio Tempestus Executor Fetial Enhort, Master of the Archives Tolemy, and Master of the Analyticae Egan -- moved in to seize power in the forge city. They had known about these revelations for several years, and were merely using the war as an excuse to open the archives and publish them. This news reached the Titans in the field as they were closing in on Hive Argentum, and caused a rift between the two Legions, for the Legio Invicta did not share the beliefs of their allies and continued to venerate the Emperor as the Omnissiah. Despite this theological strife, they continued their operations, and although they suffered some losses, they ultimately achieved a crushing victory, obliterating nearly the entire force positioned against them. Following the battle, the Legio Invicta Princeps Maximus Gearhart wished to move the forces of the two Legions back to the forge city to restore order, but was confronted by the Legio Tempestus. Despite being outnumbered by a four-to-one margin, the Legion of Orestes' acting commander issued Gearhart an ultimatum, telling him to stand with the Legio Tempestus or against it. Legio Tempestus war engines proceeded to acquire target locks on Legio Invicta machines. Bloodletting between the two Titan Legions was perhaps only averted by a miracle -- during the course of the war a large storm which blocked orbital scans emerged over the Western Prospection. This weather anomaly turned out to not be natural, but generated by a climate tower erected by the forces of the Archenemy in order to conceal a sizable part of its forces. This tower was discovered by a stray unit of the IAstra Militarum which succeeded in destroying it. The emergence of this new threat posed by a previously hidden Traitor Titan battlegroup which outnumbered the remaining operational Imperial Titans caused the two Legions to set aside their religious differences and move to face it. By virtue of the skills of the Titan princeps, the Loyalist Titan Legions succeeded in destroying this threat as well, and by the time the fighting finished, the danger of schism within the Mechanicus was already over -- Tolemy revealed to Enhort and their associate, Egan, that he had manipulated the data to produce the outcome he had desired. Enhort was infuriated, stating that altered data undermined their position and the validity of their theological claims, and attempted to contact Gearhart to acquiesce to his demands. Tolemy attempted to strangle the Executor, but was stopped by Egan, who killed him with a weapon brought to the meeting in secret -- and subsequently committed suicide, struck with grief over the fabrication that he had unwittingly assisted. Following this event, Enhort submitted to Gearhart. Orestes had been delivered from the rampaging Traitor Titans and, alongside the broader Imperium, from the danger of a terrible religious schism.