Board Thread:Warhammer 40k General Discussion/@comment-24505078-20140427055850/@comment-71.218.152.127-20140511064952

The Adeptus Arbities as said above are not there to deal with millitary threats. They're for enforcing fear and obedience in the civlian populace and enforcing the law on civlized worlds. If for example a fleet of Chaos Space Marines invade a system, the Arbities will evacuate with civilians and leave the war to stronger imperial forces. An Arbities does have access to decent imperial weaponry, however they do not have the man power nor logistics to fend off a full blown invasion. Of course there are occasions where Arbities must aid imperial forces since they're trapped on a world, but they usually don't survive.