source: Siege - Basic Concepts

→ditch : 水路, 排水溝, 堀, どぶ; (天然の)水路

→moat : 堀

noun (usually ramparts)

a defensive wall of a castle or walled city, having a broad top with a walkway and typically a stone parapet.

〖通例～s〗 〘史〙 城壁, 塁壁; 守り.

a defensive or protective barrier:

e.g. the open Pacific broke on the far-off ramparts of the reef.

verb with object

fortify or surround with or as if with a rampart.

late 16th century: from French rempart, from remparer ‘fortify, take possession of again’, based on Latin ante ‘before’ + parare ‘prepare’.