rampart
source: Siege - Basic Concepts
https://gyazo.com/635f9e6c90ccffa37db19a735c5cafad
→ditch : 水路, 排水溝, 堀, どぶ; (天然の)水路
https://gyazo.com/88c09954e960b633bcc307ab55dfa0ca
→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.
ORIGIN
late 16th century: from French rempart, from remparer ‘fortify, take possession of again’, based on Latin ante ‘before’ + parare ‘prepare’.