Salamanders - Great Crusade: During the Great Crusade the Salamanders were attached to the 154th Expeditionary Fleet, their forces complemented by Imperial Army regiments drawn from the planet Phaeria, a Death World. They successfully brought hundreds of Human-settled worlds into Imperial Compliance. One of the few notable campaigns undertaken by the Salamanders Legion during the Great Crusade was the Imperial Compliance action on the world of Caldera. Designated 154-4, known as Ibsen by its inhabitants, the Salamanders were tasked with bringing this newly discovered world into Compliance.Led by Vulkan himself, the XVIIIth Legion was joined by the Iron Hands and the Death Guard Legions, both led by their own respective primarchs. The world was undeveloped, and largely inhospitable to Human life, but possessed valuable mineral deposits. However, the Imperial forces faced stiff resistance for control of the planet from the Craftworld Aeldari, who had placed a garrison upon Ibsen. The Asuryani forces -- including Seers, Warlocks and other combat psykers -- could not have expected to defeat one Legion of Astartes, let alone three. The mystery deepened when the semi-feral, primitive Human tribes inhabiting the planet seemed more sympathetic to the Aeldari, or at the very least, not welcoming to their Human liberators.The Salamanders and other Imperial forces defeated the Craftworld Aeldari relatively easily as expected. After the conquest, the Salamanders learned that the Aeldari had been defending a network of menhirs which served as psychic nodes and that fed into a giant arch, where the final and most brutal confrontation between the Astartes and the xenos had taken place. The arch itself had been located thanks to a mysterious Remembrancer attached to the Salamanders, with whom Vulkan had had an unsettling conversation before the battle.After the slaughter ended, Vulkan saw the Remembrancer loitering by the arch and then suddenly disappearing. Following him, Vulkan and his elite Pyre Guard descended into the chambers beneath it, through a portal at its base. There they found a crude warding ceremony taking place, conducted by the primitive Human tribal priests, who were ready to sacrifice an ancient Drukhari witch. Finally, Vulkan realised the truth: the arch was in reality a Webway portal (though none of the Imperials, including Vulkan, knew this at the time); Vulkan had seen a "gate" like this before, in his Nocturnean youth, when Drukhari repeatedly utilised such a portal to raid and pillage the planet.The Asuryani had taken control of the portal by defeating their dark cousins, and in the process had freed the indigenous Human population of Ibsen from the horrors of Drukhari raids; the Asuryani had been seen by the Humans as liberators. Terrified by the defeat of their liberators at the hands of the Imperium, the natives had sought to sacrifice their Drukhari captive to ward off the inevitable return of her race; the mysterious "Remembrancer" who was nowhere to be seen had actually been the Emperor in disguise, who must have had a great interest in the particulars of this mission since He had ordered so many resources committed to it.Vulkan ordered Ibsen and its irredeemably xenos-corrupted population cleansed by the flame of Exterminatus. He renamed the scoured, Nocturne-like Dead World that remained Caldera. The world was now ready to receive new Human colonists and to be exploited for the benefit of the Imperium.Not long after the successful conclusion of the Ibsen campaign, Vulkan and his Salamanders Legion participated in another joint Imperial Compliance action on the world known as Kharaatan. Designated 154-6, the Salamanders fought alongside the Primarch Konrad Curze and his Night Lords Legion as well as Mechanicum forces, the Legio Ignis Titan Legion, and several Imperial Army regiments.During this campaign Vulkan became infuriated with his brother primarch and how his Legion brutally conducted themselves. During one notable incident, the Night Lords slaughtered the inhabitants of an entire city in order to seed fear amongst the general population. When Vulkan confronted Curze about his Legion's actions, a brief fight ensued between the two transhuman demi-gods.After the successful conclusion of this campaign, Vulkan reported Curze's savage conduct to both the Warmaster Horus and his brother primarch Rogal Dorn of the Imperial Fists Legion. This incident would later sow the seeds of animosity between Vulkan and his brother Curze, causing a rift that would further widen as the Great Crusade wore on.The events on Kharaatan would have far-reaching affects that would later play a key role in what happened to Vulkan after the tragic events of Isstvan V played out.