|KEY WORD : architecture / castles|
| Defensive castle entrance, or yin entrance.
A generic term for various types castle entrance *koguchi
虎口, considered to be defensive in character. These were designed to make it very
difficult for enemy forced to invade the castle, but did not permit easy exit
or outgoing sorties. They usually have large or complex barriers *umadashi
馬出 protecting the entrance.
Belonging to this category of entrances are Edo period designs, for example the spiral entrance tomoekoguchi 巴虎口 where a series of gates are connected by walls twisting round in a spiral formation, or the right-angled barrier kane-no-umadashi 曲尺の馬出 where the entrance is located in an indented cunner of the castle, with a square barrier preventing direct enemy access. Medieval mountain castles and border castles, built with the expectation of having to fight superior numbers of enemy troops with an inferior numbered force, utilized a defensive entrance. The term in-no-koguchi is used in contrast with *you-no-koguchi 陽の虎口, an offensive enterence.
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