Large Wooden Fence Surrounding a Motte Castle
Puzzle 17 of Babysitting Piece of Cake Pack
Question is: Large Wooden Fence Surrounding a Motte Castle
and the answer is: PALISADE
Word Meaning:
PALISADE — A long, strong stake, one end of which is set firmly in the ground, and the other sharpened.
Definitions from Wiktionary.