Therion Cohort - Notable Campaigns: Isstvan III Compliance (994.M30) - As part of the 27th Expeditionary Fleet, the Therion Cohort participated in the Compliance action of the world of Isstvan III. The local Istvaanians had a highly powerful, advanced and disciplined army to call upon, numbering even renegade psykers known as Warsingers that were so powerful that they even kept in check the might of the Emperor's Legiones Astartes. Under the command of Corvus Corax, the Istvaanians were ultimately crushed at the Redarth Valley, the primarch having called upon the 800 companies of Raven Guard Space Marines that comprised the XIXth Legion as well as their allies from the Therion Cohort and heavy assault cadres drawn from both the Legio Victorum and the Legio Adamantus to secure this Imperial victory. In a great ceremony during which a selected delegation of Istvaanians publicly surrendered before the Primarch, Corax formally acknowledged the role of the Therions in this battle.Raven's Flight (005.M31) - Having been left behind on Deliverance by the XIXth Legion before their departure for Istvaan V, the Therion Cohort followed the steps of the Raven Guard into the Isstvan System. At the initiative of Marcus Valerius, the Therion Cohort's praefactor who had been plagued by prophetic dreams, the Therion Cohort and the Raven Guard's reserve company under Commander Branne disregarded their respective orders and decided to rush to their primarch's aid. However in order for the Avenger to approach Isstvan V covertly, the Therion Cohort had to be sacrificed in a diversionary attack, which marked the end of the original cohort.Siege of the Perfect Fortress (Unknown Date, ca. 007.M31) - Located on the world of Narsis, the so-called "Perfect Fortress" had been erected by the IIIrdLegion, the Emperor's Children, during the Great Crusade. As its name indicates, the Perfect Fortress was a military base, but also a hive city harbouring many millions of inhabitants where elegant buildings and colonnades hid both administrative buildings as well as tanks and weapons depots, and where ornate balustrades revealed themselves as redoubt and every balcony was a perfect firing position on pre-planned kill-zones. Taking the Perfect Fortress would be an arduous task, a task which in truth lay beyond the capabilities of the severely depleted Raven Guard to take alone. It was then fortunate that shortly after the Kiavahrian Uprising, the ranks of the XIXth Legion were swelled by the reconstituted and vastly expanded Therion Cohort. Under the command of their newly-appointed vice-caesari, Marcus Valerius, the Therion Cohort would then take the brunt of the assault. Corax, however, asked for a heavy sacrifice from the Therion Cohort: to land far away from the Perfect Fortress and march on it while weathering its considerable fire power. For three long solar days, the Therion Cohort assailed the Perfect Fortress before their losses forced them to retreat. This was all the enemy commander, Captain Luthris, had been waiting for, as the Emperor's Children were already positionned to counter-attack. Conducting an organised retreat while being pursued, and in many places massacred by the Emperor's Children, only stands as a further testament as to the Therions' spirit and discipline, as through the sacrifice of thousands of their number, the Therion Cohort achieved their mission: to draw the enemy out. As the Raven Guard finally showed themselves and descended upon the surprised sons of Fulgrim, the Emperor's Children were swiftly defeated and the so-called "Perfect Fortress" fell within the day. This highly symbolic action would not only mark a severe defeat of the traitorous IIIrdLegion, but also heralded the return of both the Therion Cohorts and the XIXth Legion to the front lines of the war against the Warmaster Horus.Reconquest of Euesa (Unknown Date, ca. 009.010.M31) - Located in the Vandreggan Sector, the world of Euesa was the latest target in a series of attacks led by the joined forces of the Raven Guard and the Therion Cohort. A first attack on its capital city, designated as Milivan, had failed and the Therions had lost more than seventeen hundred troops in this rushed attack. However, the campaign plan dictated that Milivan and its orbital batteries be silenced within the next eighteen hours in order to allow the Raven Guard to conduct a lightning attack on the fortified complex where the planet's rulers had taken refuge. By the time of the Euesa campaign, the Therion Cohort formed the core of an Imperial battlegroup, consisting of the Therion Cohort, the Capricon 13th Suppression Regiment and its heavy tanks and the men and women of the Lothor Pioneer Corps. The army was supported by several Titan maniples drawn from the Legio Vindictus as well, all heeding the words of one man: Marcus Valerius. With preparations for a renewed assault well on its way, Valerius was again troubled by prophetic dreams, showing him in the clutches of a hydra. Acting upon these dreams, but not daring to mention them to anyone save for his manservant, Marcus Valerius withdrew several companies of Therions, the Capitol Imperialis super-heavy tank Iron General and two Battle Titans to act as reserve. These he placed under the command of his younger brother, Antonius. While the other officers had some misgivings towards this, as it would considerably weaken their strength for the main attack, Marcus Valerius insisted upon taking precautionary measures in case the army's flank was unexpectedly threatened. This proved to be the case as traitorous Imperial Army regiments approached the army's rear using recovered Raven Guard ident-tags. Forewarned by his dreams, Marcus Valerius ordered his brother to engage the enemy which was promptly wiped out. Milivan was taken within the morning and the true Raven Guard conducted the final attack unimpeded.