Maybe they could use stun prods and dart guns with tranqualizers.
After you get caught you will be taken to one of their camps as a slave, and take all your stuff, when you wake up you'll have to fight your way out and reclaim your equipment.
or thrown to the centaurs for their amusemant and the right to earn your equipment back and place in the legion. nothing scares a man worse than fighting 10 men sewn together.
@savagebeatings, it would be nice to see towns change control several times, like a town is normal, then you can persuade raiders to take the town, the town gets adorned with corpses and blood and such, then you can persuade the Legion that these raiders are vulnerable, they go in and slughter them, and for a day, you see crucified corpses everywhere and legion guys beating the crap outta prisoners. then after tha day it goes to being more organised and such. and then you can persuade the raiders to try again, after the legion gets cut down you see the raiders celebrating by dancing around in their clothing, drinking, partying and such..and this thing repeats over and over.