Defence of Solaritus

The Defence of Solaritus was an Imperial defensive undertaken by the Hammer Guard Space Marine Chapter, alongside their allies from the Novus Krakens Chapter, to defend the Solaritus Sub-Sector from a joint-Chaos attack carried out by the Forsaken Hammers and Leviathans Eclipse Chaos Warbands.

History
In 999.M41, the 2nd Company, after being forced to retreat from the Helgian Gulf after being ambushed by the forces of the Forsaken, returned to the Gabarlos System to warn the Hammer Guard of the return of their former Brothers. Fearing a coming attack, Dominum Custodem sent the 4th Company on a journey to find ideal recruiting worlds and potential aspirants, so that the chapter could fill the holes in their ranks, while the rest of the chapter separate and fortify their main recruitment worlds in each system of Sub-Sector Solaritus. Not long after the 4th Company left, however, Cadia fell and the Eye of Terror opened, sending the Great Rift through the heart of the Imperium. Left on the other side of the galaxy-spanning warp storm, the Hammer Guard were trapped within the systems of Sub-Sector Solaritus, alongside their allies the Novus Krakens.

When Sub-Sector Solaritus was reunited with the Imperium by the Indomitus Crusade, the crusade force discovered the Hammer Guard fatigued and worn, each group describing their part in what became known as the Siege of Sub-Sector Solaritus. For 37 years, the forces of the Hammer Guard had defended their recruitment systems from the Forsaken, the Leviathans Eclipse, and their cultist armies, whose origins were explained by the string of chaos-gripped worlds nearby the Sub-Sector. With each system came a different part to the tale, with the forces in Modago describing the void combat above Devax Victrii and assault by an army of fanatical cultists, while the defenders of the Solaritus System telling of a siege on Solaritus Prime by cultists and the rise of the Bloodthirster Kale'malum on Gabarlos, which was only put down by a desperate attack from the 3rd and 7th Companies, with the aid of the Novus Krakens.