House Col'Khak - Notable Campaigns: Drop Site Massacre of Isstvan V (566.006.M31) - The Col'Khak Collective dispatched a full supporting cadre of Knights in assistance to a Legio Atarus demi-legio sent to support the Loyalist assault on Isstvan V. All were subsequently lost alongside the Titans of the Red Naga War Maniple. The warriors of Col'Khak swore revenge on the Traitors and were most eager to join the battle against the Traitor forces of the Warmaster Horus.Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - House Col'Khak took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, House Col'Khak provided Knight support to the Legio Atarus. 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.Cataclysm of Iron (010.M31) - Across border sectors of the Segmentum Tempestus and the Segmentum Pacificus are located numerous lesser Forge Worlds known collectively as the "Belt of Iron". Since the sundering of the Imperium, many declared for the Traitor cause at the engineering of the fabricator-general of Mars, while others remained loyal to Terra or sought to remain as aloof as possible from the conflict. Strife and tentative conflict between these once-aligned worlds erupted into full-scale war in 010.M31, pitching the Mars-aligned Forge Worlds of Incunabula, Urdesh, Valia-Maximal and Kalibrax against the forces of the Loyalist worlds of Graia, Arl'yeth and Atar-Median, while Arachnis and Jerulas Station both fell into civil war. The resulting conflict, later known as the "Cataclysm of Iron," saw the forge lords, their armies and allied Titan Legions and Knight houses turn on each other in protracted warfare, with scores of Human-inhabited worlds in the region suffering as they become the battlegrounds upon which the combatants fight.Assault upon Findari Prime (215.010.M31) - In what is now seen as the first blow of the Cataclysm of Iron, the arrival of the Iron Warriors prompted Atar-Median to assemble its forces to war and fall upon the Findari Spoil. Though the Forge World had long been aware of the efforts of Kalibrax within the system, and long suspected that Kalibrax remained in service to the treacherous fabricator-general of Mars, the arrival of those sworn to the Warmaster Horus proved sufficient evidence to confirm Kalibrax's motives. Tactical assessments of the Spoil prior to its invasion reveal the extent of its transformation undertaken by the Traitors. The outer edges of the system showed a significant concentration of orbital defence platforms constructed upon the extensive asteroid belts, while the solitary planet held a partially constructed Legio fortress garrisoned by several maniples of Legio Kulisaetai Titans kept in stasis within. Desiring control of the sector and its defences rather than total destruction, the forces of Atar-Median, under command of Princeps Maxima Millicent Nuvarss, First Shield of Atar-Median, divided their fleet into two task forces. The first, consisting of Taghmata forces supported by several Banners of House Col'Khak, formed the vanguard of the invasion, breaking from the Warp in close proximity to the system's outer defences. Weathering heavy fire from the Traitor defence stations, the Mechanicum forces quickly boarded the first ring of defences, the ground troops methodically eradicating all within. As this battle raged, a second fleet transitioned into the system, heading directly for the solitary planet. The loss of the outer defences left only minor orbital batteries to repel the Loyalist fleet and it was with little effort that the second wave of vessels seized control of the planet's exo-sphere. Having gained orbital control, the vessels' complement of Legio Atarus Titans were unleashed upon the planet, intent on seizing control of the Gatekeeper fortress. The resulting battle unfolded in two stages, with the Firebrands easily overwhelming the outer defences, guarded by a mere handful of Gatekeeper Titans. Once the outer walls had been seized, the Loyalists ventured into the cavernous centre of the fortress, providing protection for a cadre of Tech-priests that, having gained access to the central systems, laboured to wrest control of the fortress from the Traitors. In the days following their victory, Legio Atarus moved to secure their hold upon the Findari Spoil, hunting down those Gatekeeper Titans that had escaped the fall of their fortress, while Atar-Median Taghmata, supported by House Col'Khak Knights, secured their hold upon the system's orbital defences. In a single solar standard week, the Loyalist forces had claimed dominion over the Findari Spoil, casting out the Traitors and claiming the first victory of the coming conflict.Relief of Xiloci II (924.010.M31) - The main objective of the Loyalist force was the seizure of Xiloci II, reasoning that, by securing the sub-sector's capital, they would rob the Traitors of the ability to secure victory within the region. After three solar months of protracted warfare, the Traitors were ousted from much of Xiloci II, with their ground forces holding only a handful of hive cities after Kalibrax had evacuated the surviving elements of the Legio Kulisaetai. The last resistance to Loyalist control was quashed after a determined assault upon the hive city of Tartunrus Spyre which Xixos himself took part in, directly commanding the conflict from within the Legio Astraman Warlord Titan, Grace of Wrath. Unwilling to expend time and lives upon another siege, the fate of Tartunrus Spyre was sealed when the guns of the Legio Astraman were turned upon the mountain around which the city was constructed, burying it beneath an avalanche of stone. Once dominion of Xiloci II was secured, the Knights of House Col'Khak were tasked with rooting out any remaining resistance while Xixos committed his forces to regaining control of the remaining worlds within the Xiloci'ny system and beyond.Fire & Fury - Second Invasion of the Findari Spoil (091-417.020.M31) - The barren world of Findari Spoil contained within its borders saw the tread of Traitors once more when an assault, spearheaded by the warriors of House Vextrix, made landfall upon the planet. This caused much confusion to the First Shield Nuvarss who had been tasked with defending the Spoil, for the force assembled by the Traitors posed only a minimal threat to the defences erected by Kalibrax years before and since strengthened by the Tech-priests of Atar-Median. The actions of the Traitor forces also stood at odds with conventional invasion tactics, with roaming groups of House Vextrix Knights moving from location to location, with evidence of collapsed digsites at the centre of each. To understand the logic behind the Traitor forces, a directive was issued demanding the capture and interrogation of a Traitor Tech-Priest in order to extract the purpose behind the invasion. After several weeks of running battles, during which House Vextrix managed to fell three Legio Atarus Titans amongst the World Spine Crags, the warriors of House Col'Khak achieved their goal, capturing a Tech-Priest left behind as the Traitors enacted a hasty evacuation of the planet's surface.Battle of Ice World Tralsak (011.M31) - The shallow, frozen oceans of Tralsak are flash-boiled to steam by the fury of engine-war as full Household of Knights from House Col'Khak and Loyalist Titans of Legio Atarus and Legio Agravides clash with the Traitors of the Legio Magna and Legio Victorum as the Loyalist Shattered Legions and Traitor World Eaters fight across the disintegrating landscape of ice floes. Ultimately, outright victory eludes both sides, and each uses the cover of the world-enveloping fog thrown up by the destruction to extricate their forces and redeploy them elsewhere. Nevertheless, numerous supporting Knights of both sides remain to fight a war in which neither will concede defeat.Imperial Muster at Beta-Garmon (012-013.M31) - When the Traitor Titan Legions joined the Warmaster's rebellion, they brought with them hundreds of vassal Knight Houses. Some of these joined Horus' cause willingly, eager for their piece of glory alongside the Space Marine Legions, while others came begrudgingly, honouring ancient oaths. Others still fought for years alongside their allied Legios until they discovered the extent of the lies they had been sold. On the opposing side it was the same, and though many Knight Houses upheld their oath to the Emperor above their accords with the Collegia Titanica, some did so only reticently, waiting for their chance to side with the Traitors. Among both Traitor and Loyalist Knight Houses , both those of the Mechanicum closely allied to a Forge World , and the Imperial Knights who held oaths principally with the Imperium, some were bonded to a Titan Legion. Bonded Knights would bear the heraldry and the colours of their Titan Legion, giving up that of their House while they served under a Princeps Seniores. Others came of their own accord, retaining the heraldry of their home world and fighting independently alongside the Legios, or if they chose, offering up their  services to commanders they believed were righteous or just in their cause.