Siege of Orlrava

The Siege of Orlrava is the current ongoing Imperial campaign led by the efforts of the Thunder Guardians Space Marine Chapter, alongside several other Adeptus Astartes Chapters and an Adepta Sororitas Ordo Minoris, to hold back the darkest of encroaching xenos and the legions of Chaos. This campaign is part of the much larger Indomitus Crusade.

History
Following the destruction of the fortress world of Cadia during the 13th Black Crusade and the formation of the galaxy-wide warp rift known as the Cicatrix Maledictum, the Thunder Guardians' demesne was subjected to a massive warp storm. The Orlrava System was inundated by a large incursion of the Forces of Chaos. Sensing the vulnerability, all matter of xenos, including Tyranids and other xenos species, assail the beleaguered system. The Thunder Guardians stand resolute against these threats, receiving assistance from only the Dragonslayers, detachments of Crimson Fists and Nighthawks Chapters as well as the Battle-Sisters of the Order of Blood's Blessing. These valiant Imperial defenders are all that stand as the bulwark against the myriads of Mankind's enemies, which assail the system on all sides. Despite their valour and skills in battle, all but three planets have already fallen. Facing their darkest hour, the Imperial forces have already begun the first stages of an all-out counter-attack. Only time will tell, whether or not they will prevail against the forces of disorder.