Relief of Rael's World
From Warhammer 40k - Lexicanum
In 814.M39 the Penal facility on Rael's World was the target of a concentrated assault by a coalition of Alpha Legion Warbands and many amongst the Segmentum's High Command were unwilling to expend their overstretched resources in its relief. Then with no warning or explanation a Dark Angels strike force intervenes and the Alpha Legion Warbands are routed and their leader captured by the Dark Angels. Unknowingly to the planet's population, the deliverance of Rael's World is seemingly a by-product of the Chapter's ongoing Hunt for the Fallen.