User blog comment:BlackTempest/Defense methods against the creatures of the Grim./@comment-15586611-20130816205612/@comment-4773581-20130817073312

I'd say the criminal(?) underworld makes for a pretty good defense force. Self-sustaining and going to be there anyways. Plus citizens (including 15 year old little girls, and possibly extending to even younger ages) can apparently own very dangerous weapons and not get reprimanded for it, the entire population (or a good portion of it, anways) could very well be a makeshift and rag-tag defense force for anything that actually gets in, leaving a need only for patrols and watchpeople. Because a lot of people using a lot of guns is probably quite effective against the beowulves and other small Grim(m).

But there's also very large walls, robot defenders, and good natural location/terraforming as other possible defenses. And then there's the mixing-and-matching, which could very well lead to all of the above being the case.