Set up some car alarms and set them to honking to scare off deer and dumbass trespassing hunters. Remote control so no confrontation occurs.
Maybe better yet, a sound system and hidden outdoor speakers for you to shout at about 150 Db, "You Dumdass Trespassing hunters get the hell off my land." Keep it up till they and the deer are gone for the hunting season. The deer will return.
I'm still a bit confused as to why these guys aren't under arrest for threatening you while armed and other crimes.
P.S. It's easy for me to make these suggestions for the comfort of my home. Your situation might make these not-so-good ideas.