I have no interest in killing them. I want to do this humanely. Plus, they're in the attic. The attic is technically not living space...storage at best. But, I can understand how they'd be a nusance.
I don't think I'll be going at this "Great Outdoors style".
I'll go over there one night, after dark and wait for them to leave to feed. Once gone, I'll seal up the hole. After my initial post, I an idea popped in my head with where they might be coming in from.