If these people put ropes around whole monuments and pull them down, how is a bit of wire fencing going to stop them?
I’ll leave that up to engineer-types.
Right, no barbed wire near the monuments, please! That would destroy the haunting beauty of this battlefield, where so many fell. Simply install lots of surveillance cameras near every monument – if the Park Service hasn't done this already.
That, plus a high security perimeter fence for the entire park. The American public will support the expense.