Aurora Chapter - Notable Campaigns: Second Siege of Cthonia (013.M31) - A fleet of the Sons of Horus known as the True Sons and Traitor support elements separated from Horus' vast armada and bypassed Sol to attack Cthonia, the XVIth Legion's homeworld. The Imperial Fists garrison, with a small detachment of the Ultramarines' 4th Chapter ("Aurorans") stationed at the Astagar Garrison, were outnumbered and isolated, with nowhere to retreat to, and were forced to rely on the hope of a relief force from Terra to break the siege. However, they were left to fend for themselves as the Siege of Terra, the epic final confrontation between the Traitor and Loyalist forces, took place a standard year into the brutal campaign on Cthonia, forcing both sides to fight a protracted and grinding war of attrition. Only with the timely arrival of a large Dark Angels Legion fleet were the Loyalists able to achieve victory, however, it was pyrrhic at best. Cthonia was destroyed and rendered into a Dead World, serving as a stark reminder of the rewards of treachery, though this action marked the start of the unit cohesion that would lead the 4th Chapter to be split off during the Second Founding as the Aurora Chapter.Armoured Assault on Grylos (282.M36) - The massed armoured spearheads of the Aurora Chapter broke the Ork invasion of Grylos.Eukari Insurrection (330.M41) - The Imperial world of Eukari was struck by a rebellion led by the forces of Chaos in 330.M41. In response, its planetary governor sent an astropathic plea for aid. As Eukari lay within the region of Elara's Veil, it was within the sphere of responsibility of the Emperor's Spears. The Chapter dispatched a strike force led by Captain Trystance to aid the world. When the Emperor's Spears force arrived, Trystance discovered that the Aurora Chapter was already fighting the rebels. The Aurora Chapter commander berated the Emperor's Spears upon their arrival for failing in their responsibilities to guard the Veil and requiring others to fight their wars for them. This angered Trystance and he ordered the Emperor's Spears' strike force to deploy right into the heart of the rebels' capital city. Though they suffered heavy causalities, over three solar days of fighting, the Spears killed the rebel Chaos Lord and thus earned the majority of the glory of the battle for themselves. Trystance then informed the Aurora Chapter's commander that they had no right to mark the Battle of Eukari as a victory on their war banners, since the Emperor's Spears had actually carried out the operation that resulted in the defeat of the rebels. This led to a squabble between the two Astartes captains, which ended in an honour duel between both Chapter's champions. Yet even this failed to stop the bickering, as the duel proved inconclusive and both Chapters claimed they had won the contest. Eventually a shot rang out and both sides attacked in an internecine battle, which resulted in even their orbiting fleets unleashing their weapons upon one another and causing significant damage before a ceasefire was eventually declared to stem the losses. Since both Chapters were Ultramarines successors, the Ultramarines dispatched a group of representatives to finally end the conflict. Upon further review, the Ultramarines ruled in the Aurora Chapter's favour and held that the Emperor's Spears had acted impulsively. The Ultramarines arbitrators also found that the Emperor's Spears had not followed the dictums laid out in the Codex Astartes. As a result, the credit for the victory over the rebels was to be shared equally between the two Chapters. Though the Aurora Chapter was satisfied with this decision, Trystance was infuriated at the outcome, and vowed he would never set foot on the Ultramarines' homeworld of Macragge again even if the home of his primarch found itself imperiled. The Emperor's Spears bitterly claimed the outcome was the result of the Ultramarines' cultural inflexibility as a Chapter and their expressed preference for the Aurora Chapter as an organisation that was more compliant with the dictates of the Codex Astartes than the Emperor's Spears. Thereafter, the Emperor's Spears no longer had a close or cordial relationship with their two brother Chapters.Goru Heresy (650.M41) - When a Chaos-inspired nihilo-cult usurped power in the Goru System, the Aurora Chapter executed a lightning campaign that decapitated the heretics' inner circle and restored order to the region within ten days of their deployment. There was scant cause for celebration however, as the Chapter Master, Lord Herak Nhuson, was killed when the heretic leader unleashed a Warp fuelled psi-vortex as a dying act of spite.Redemption Rebellion (744.M41) - In 744.M41, after joining forces to defeat the Alpha Legion warband responsible for the Redemption Rebellion, the Aurora Chapter and the Knights of the Raven swore a bitter feud against each other, each blaming the other for their grievous losses. This conflict was only ended by the intervention of Ultramarines Chapter Master Marneus Calgar himself.Zeist Campaign (999.M41) - The Aurora Chapter heeded the call of the Ultramarines' Lord Macragge, Marneus Calgar, in the Eastern Fringes of the galaxy to take part in the Zeist Campaign against the T'au Empire in 999.M41. The Aurora Chapter provided armoured support in the form of Predators to help spearhead the assault on the T'au-occupied world of Augura. This world served as a staging point for the T'au forces during their Third Sphere Expansion campaign into Imperial space. But due to the overwhelming force provided by a combined task force assault of close to a dozen Space Marine Chapters, the T'au were forced to withdraw to protect more secure territory within their own borders. Unfortunately, though the Space Marines had won the war and stopped the T'au's seizure of Human territory, it was not possible to sanction a retaliatory thrust into T'au-held space as the individual Space Marine forces were required elsewhere in the galaxy to hold the line against the forces of Chaos during the height of the 13th Black Crusade.Reconquest of the Forsarr Sector (999.M41) - Three standard years after the fall of the sector's vital Hive World capital of Forsarr in the Segmentum Tempestus, the Administratum finally recongnised the true threat posed by WAAAGH! Garaghak. The Aurora Chapter joined a powerful coalition with their brethren of the Revilers and the Death Eagles as well as a demi-legio of Titans of the Legio Astraman and several regiments of Imperial Guard and Ecclesiarchal troops. They took the fight to the Orks and reclaimed the Forsarr Sector for the Emperor. It is unknown if the fact that the Raven Guard's homeworld of Deliverance is also located in the Forsarr Sector prompted this deployment.