Castle Piece

Castle Piece is a moderately sized Hillfort in Roe Enclosure; or is it?  It is a banked enclosure with possibly a very shallow outer ditch, although its defencive capacity is doubtful. I know its been weathered and I know that later plantation works have been carried out; but still, taking that into account, the banks are slight as is the ditch, hardly defencive.  I wonder if the banks are more defining boundaries for a small settlement, with some defencive capabilities  although more to do with land tenure? I need to read up what I can on the site and take a longer more detailed look at the remains and their place in the landscape.