The world was targeted for conquest during the early Great Crusade by the First Legion of Astartes. What seemed to be a simple conquest became a disastrous debacle as the then-stagnated First Legion faced an unnamed Xenos breed. The First Legion Grandmaster committed a small force to the assault the xenos. Yet the aliens proved a threat unlike any other faced before, fighting without regard for sane tactics and with technology that defied explanation. The First Legion's attack was repulsed with heavy losses and the Astartes suffered their first true defeat in decades. The subsequent second and third assaults by the First Legion saw the same result, forcing Grandmaster Hector Thrane to lead one final attack. This attack initially made headway but was overwhelmed by the sheer number of xenos. Thrane, realizing his folly, chose to remain behind with his guards and sacrifice himself to allow for his brothers to retreat. The First Legion took to orbit and reduced the planet to ashes.