ORIGINAL: twildasin
Act like a mad man fire your 45 up in the air like 5 times start screaming at them and tell them they dont want to move or it could get ugly! Then if they have the balls to move well try to get there license plate if you did not already. Or tell them you already got it and if they run it will be worse.
And then take cover because when you start shooting into the air they may very well start shooting at you. Live to hunt another day, let the authorities deal with them. Remember what happened in WI. a couple of years ago regarding a trespasser.