A fort located at a strategic location on a sea coast, riverbank, or island. It was furnished with large guns. Daiba were…

Also written 大陰虎口. A simple, early form of castle entrance *koguchi …

Lit. large *tenshu 天守. The principal tower. The largest tenshu in a…

A wall projecting 15-30 cm outward from the flat top, *inubashiri 犬走り, of a…

A compound that juts out or is slightly separated from the main components of a castle complex, which include: the main…

1　Outer citadel. Also tsukejiro 付け城, hajiro 端城, edajiro 枝城. A type of branch…

A loophole, *sama 狭間, that projects out from the frame of a window opening in…

1　Lit. earthen bridge. An earthen bridge, which is made by leaving an unexcavated section of moat in front…

Also dorui 土塁. An earthen embankment, earthwork, or rampart. A defensive embankment surrounding a castle or a…

The foundation bed, shiki 敷, of an earthen embankment, *doi 土居. It has…

Lit. independent donjon or keep. Also called dokuritsushiki tenshu 独立式天守, dokuritsu tenshukaku 独立天守閣. A…

1　The flat top of an embankment, *doi 土居, also called *…

Lit. "inner horse exit." A defensive installation *umadashi 馬出 constructed to fortify the…

1　The inner moat of a castle that has two or more moats.

2　The moat dug on the…

Also read naikaku. Also called naijō 内城. An inner compound. Generally, it refers to the central…

Lit. "pounded and inserted stone joinery." The most common stone work technique used to build a dry construction castle wall…

Lit. "inner square box." A type of walled compound *masugata 桝形…

A type of loophole *sama 狭間. An opening in a wall for soldiers to…

A main castle gate *koguchi 虎口 with a small barrier or compound…

A castle entrance barrier. A small barrier or compound, built in front of a castle gate *…