RE: Men, I need your help
Right now sounds like your only recourse is to file charges for trespassing.. Well, the landowners have to do it..
Or if you have a written lease; you could do it.
Like some others do, if you have access to infared trail cameras, place them in spots where you know they are coming in.. Proof of trespassing or, by chance, catch them on film doing something more drastic...