I could be wrong, but my guess is you don't have a ton of experience with this. I've dealt with lands that have had absentee landowners for sometimes 50 years. Word gets around and sometimes it takes a few years to convince all the parties that it isn't a free for all. I've had to make some compromises with a few trespassers cause I knew it was the only way to control the flow of more (like granting hunting rights on a small piece). Running in and blowing things up often time will cause more problems in the long run. Figuring out why people are on the place and if you can really keep them off (without the national guard) is a good first step.