Biggest thing you can do is make sure your land is posted, and posted good. Nobody likes to have people get over on them, but be careful with any form of confrontation. Even in the right, you could be the one that suffers dire consequences. Remember what happened to those fellas in Minnesota a few years back. Confronted a trespasser armed, and a lot of people ended up dead. No fault of their own. Tragic. Call the local law, not the game warden, when you confront trespassers. Do it before you confron them, and let them know you've called. They'll leave quietly. Second time, call the law and prosecute. In Virginia, you deal with the dog hunters for six weeks. By law, they have a right to retrieve dogs off your property. That would be on foot and unarmed. They forget that frequently. County Deputies have no problem reminding them.