2 Metaphors for palisading

The inner palisade which shut off the horses must now be our line of defence, and the poor beasts must be left to their fate.

Manuel's lackeys did not at first like the looks of these heads, and said they were unsuitable for Christmas decorations: but Dom Manuel explained that at this season of general merriment this palisade also was mirth-provoking because (the weather being such as was virtually unprecedented in these parts) a light snow had fallen during the night, so that each head seemed to wear a nightcap.

2 Metaphors for  palisading