Bloodtide War

Background
During almost six years, abominations made of living metal and clad in the rotting corpses of their victims emerge from deep into the Ghoul Stars. Six backwater worlds are ravaged, their entire population slaughtered in the most horrific fashion. When the foul beings finally descend on Ionnacaira, they are met with the entire might of the Chapter. The Storm Angels fought with greater rage and fury than ever before, still led by their first Chapter Master, whose name has been lost to history. However, before the unrelenting horde of xenos, they are forced to retreat from the outer border of their system to their homeworld, mounting a desperate defense.

During six years, the unrelenting Bloodtide almost overpower the Chapter. However, the aliens are finally destroyed and repelled, as their inability to slaughter the primitives inhabitants of the Oceanic World seems to drive them to near suicidal behavior and infighting, as those whose rotting parts have utterly succumbed to age assault those who are still clad in relatively fresh gore. Finally, the last of the abominations are repelled, after having slaughtered a great number of the natives. The Feast of Victory which follows lead thousands more to their death as the Astartes gorge on the flesh of their human kin to celebrate the end of those dark times.