First Cordanian-Severan Dominate War

The First Cordanian-Severan Dominate War was an Imperial castigation campaign carried out by the 501st Cordanian MIR and other military forces of the Imperium of Man against the secessionist forces of the Severan Dominate of the Spinward Front in the Calixis Sector of the Segmentum Obscurus.

History
Several years after the Calixis Sector seceded from the Imperium of Man under the leadership of the former Sub-sector Governor of the Periphery, Duke Severus XIII of Kulth and became the Severan Dominate. The 501st and several Cordanian Regiments was sent to reclaim the system and bring them back into Imperial Compliance. They soon found out that they have made deals with some of the vile xenos races. One of these race was their most hated foe, the vile Drukhari. Finding evidence of this and the heresy that the Severan Dominate was doing to their own citizens. They quickly went to the Haeresis System and begun their first campaign. They may have known that the Imperium was coming but they did not know how fast the Cordanians would arrived and begin their attacks. They manage to quickly take out the system's fleet, Planetary defense weapons and then made planetfall. Within two days, they establish a FOB on the capital planet of the system. The 501st, 560th, and the 412th Cordanian Regiments will handle the Capital planet while the other Cordanian Regiments will bring the other planets and research stations back to Imperial Compliance. By the end of the year, the war was won. But they stuck around a bit longer so that the system has a strong defense for Imperium and the loyal citizens were safe from any counter-attack from the Severan Dominate or any other enemy of man.