A perimeter of rebar 8" high,set 1' apart would play hell with both track,and rubber tired vehicles.
I've more than one trackhoe,dozer,or front end loader taken down from running over rebar.
It gets between the tracks and bust them apart,and punches big ripping holes in even the thickest tires.
Jersey barrier pinned,and set up in a ladder pattern(10'×10'squares),will stop even a tank from crossing.(See tank in"Scariest Police Chases I).
Matt