Pikey Hunting is misleading. What you actually do is scout(or hunt) out thier squatting ground during the day, when it is much less dangerous, then return at night.
I am basing this on the Bedford way of doing things, it may be diffrent in other places. We bring a small group of friends, and the aim is to get as far as possible into the campsite before you go back. You may want to enliven the process by seeing who can get to a caravan door and knock on it, etc. Only for the hardened