I am in a similar situation to you in that I am a single woman living in the country (and I was not born and bred here). I have had some minor neighbor issues over the years, but nothing as confrontational as yours. One thing I have learned though, is people in the country respect property. My neighbors like to come over on my land--one with a fence and another with a lawn mower but no trees have been enclosed or cut. They see my chickens as livestock and a business and would not interfere with them. Your neighbor has openly expressed an intent to steal from you. Treat him as a thief and call the sheriff.