>> When the wrong people go up into those hills or back into that swamp, they’re never seen again.
And sooner or later the hill, swamp and pasture people will be moved to take up their arms and venture into the cities... carefully, after diligent planning, alone and in small cohesive teams...
Nah, just cut ALL services into the cities and wait for them to come out to you. Loads easier. Plus they’ll be killing each other too, thus reducing the number we have to dispose of when they come out of the cities.