noun
bulwark; earthwork; defensive fortification
Refers to a defensive structure, often an earthen rampart or wall, used in military contexts. The term is somewhat technical and may appear in historical or archaeological descriptions.
元寇の際に築かれた防塁が今も残っている。
The bulwarks built during the Mongol invasions still remain today.
城の周囲には土の防塁が巡らされていた。
Earthen bulwarks were constructed around the castle.