If your hometwon as spun back into colonial (Like cowboy days kinda, altered) days and then attacked by hellish creatures what would you do? Who would you be, and what weapon? I'd be an Outlaw on the run. I'd stick to the shadows with an old pistol on my hhip next to a bad a$$ whip.
i'd gather my remaining friends and we would become a raiding clan that mugs any passerbyers and rape the women. The children will be used for entertainment and in time, they will take our place. This will repeat and the cla will thrive.
I would try to keep from getting a long-lasting name to avoid being too close to people who were probably going to die. I'd stay in less populated areas, and I'd probably steal or make whatever materials I needed. For a weapon, I'd go with a classic gun of the time, a horse, and some sort of large, blunt, and/or sharp object. I would probably be more focused on my own safety rather than the safety of others at that point.