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|Commanders1 =[[Emperor]]<br>[[Praetor (Rank)|Praetor]] [[Maral Lupus]]{{Fn|7}}

Legion XVI acted as the force's vanguard, launching itself towards Luna from Earth-based rockets. {{Fn|1}} This vanguard was commanded by [[Praetor (Rank)|Praetor]] [[Maral Lupus]], "the White Wolf".{{Fn|7}} Behind them came smaller waves from the VIIth and XIIIth Legions. The formidable ground based defenses on the surface of Luna controlled by the gene-cults opened fire. The Emperor used Legions VII and XIII as distractions, allowing Legion XVI to land assault craft unnoticed. The Astartes quickly moved into the gene-cults underground complexes, battling half-machine genetic monstrosities. These initial positions fell within seconds, with the hundred or so cultists inside dead before even realizing they were under direct assault. The Astartes disabled the cultists' orbital defenses from inside, allowing Legions VII and XIII to land and begin a systematic annihilation of all their remaining resistance. The battle only lasted six hours before all resistance on Luna crumbled. The surviving gene-cultists surrendered, begging that the Emperor "call off his wolves". The now-humbled gene-crafters of Luna would be granted mercy, but were enslaved by the Emperor for His own plans.{{Fn|1}}