Not So Nice Neighbors and No Trespassing Signs

We recently purchased 7 wooded acres of land and are building a new home.  I have posted No Trespassing/Private Property signs all over.  My not so nice neighbors took it upon themselves to remove the signs, bend them and toss them into my garage.  The house is still under construction.  I had a sheriff’s deputy assist me in putting new ones back up.  My reason for having the signs up is to protect myself against law suits from people entering the property and getting hurt or damaging my property.  Am I wrong in doing this?  This is becoming a major issue with the neighbors.  It is in the country and only 4 homes on the street.
You are free to post whatever kind of signs you choose on your property.  If your neighbor is tearing them down he is trespassing by removing the signs and also maliciously damaging your property, a misdemeanor.
I’m not sure the signs do much to keep someone from suing you if they get hurt while on your property, though.  They could help you establish that any uninvited person on your property was trespassing.
Your best option may be to talk things over with your neighbor. If he continues to remove your signs you would probably need to catch him in the act to prosecute.