Kuruwa

Kuruwa

is also used for castles built after the Edo period. The kuruwa serves as a defensive territory, provides space for additional castle facilities, and contains the living quarters for common soldiers, making it an important fixture of all Japanese castles. Most castles built during the middle ages contain many kuruwa of small area, while those built during or after the early modern period often contain a lesser number of kuruwa of larger area. The western equivalent is the motte-and-bailey.

Arrangement

The shape and structure of a castle were important factors in determining the victor of castle sieges, and the castle layout, or nihongo|"nawabari"|縄張 was arranged with the intention of giving the defender an insurmountable advantage. The kuruwa regions were planned for after the basic layout of the castle grounds was decided. The three basic kuruwa regions are the nihongo|"honmaru"|本丸; the core of the castle, and the nihongo|"ninomaru"|二の丸|lit. "second circle" and nihongo|"sannomaru"|三の丸|lit. "third circle", which serve as auxiliary areas.

There are three major styles of kuruwa arrangement:;nihongo|Rinkaku style|輪郭式|rinkaku-shiki:The "ninomaru" and "sannomaru" surround the "honmaru" at the center. This arrangement increases the castle's defense in every direction, but surrounding each kuruwa requires a large area of land to be alloted to the castle grounds. Yamagata Castle is an example of a castle that uses this arrangement.;nihongo|Renkaku style|連郭式|renkaku-shiki:The "honmaru" and "ninomaru" are arranged side by side. This causes the depth of the castle to increase, but the sides and rear of the "honmaru" are exposed, making the castle more vulnerable to attacks on areas other than the central gate. Matsuyama Castle and Morioka Castle both use this kuruwa arrangement.;nihongo|Teikaku style|梯郭式|teikaku-shiki:The "honmaru" is placed adjacent to the castle walls, and additional kuruwa are placed surrounding the "honmaru". This arrangement is suited for castles built along natural barriers like swamps, rivers, mountains, or cliffs, since the natural barrier can cover the exposed side of the "honmaru". Okayama Castle employs this arrangement.

Many castles use a combination of the above three styles, and may fit into multiple categories of arrangement. Some castles may not be categorizable at all. Smaller kuruwa regions called nihongo|"obikuruwa"|帯曲輪 and nihongo|"koshikuruwa"|腰曲輪 were sometimes placed around the central kuruwa in some arrangements. nihongo|"demaru"|出丸 refers to a kuruwa that is placed independent from the central kuruwa, and nihongo|"umadashi"|馬出 refers to a kuruwa that is placed specifically to guard an important entrance. See below for more related terms.

Related terms

Most of the terms take the form "-kuruwa" or "-maru", but specific terms may differ depending on region or time period. Castles that use the naming "-maru" were built during the early modern period. Many castles contain kuruwa named after particular people or places.

;"Honmaru":The "honmaru" is the core region of the castle, and serves as the living quarters for the castle ruler, and is the final line of defense of the castle. It may also be referred to by many other names including "ichi no kuruwa" or "honkuruwa". The kuruwa can house an expensive central structure from which the castle ruler oversees the on-goings within the castle, or those affairs can be conducted from the outer walls so that the "honmaru" can be used as a compact, core structure that serves as the final line of defense during a siege.

;"Tenshumaru":The "tenshumaru" is a smaller kuruwa often located within the "honmaru" which houses the tenshu; the central fixture of all post-Sengoku period Japanese castles. Very few tenshu remain intact, and Kōchi Castle is the only castle that still contains its original "tenshu". Tenshu entrances remain at Kawagoe Castle and Matsumae Castle.

;"Ninomaru" & "sannomaru":Also known as "ninokuruwa" or "sannokuruwa", these regions serve as outside layers to the "honmaru", and may vary in shape and size. Expansive ones can also house large living spaces similar to the structures within the "honmaru" itself.

;"Nishinomaru":"Nishinomaru" (lit. "eastern circle") is used as the castle ruler's retreat. The term was coined after Tokugawa Ieyasu, who lived in the eastern section of Edo Castle after retiring from his post as ruler. "Nishinomaru" are also present in Himeji Castle and Okayama Castle.

;"Obikuruwa" & "koshikuruwa":These terms refer to a narrow space created by walls to surround another kuruwa. They allowed defenders to better prevent the breach of an important castle sector, and were double-layered in the largest castles.

;"Sōkuruwa":This term refers to a kuruwa created by surrounding the castle town with a large moat, earthwork fortification, or stone wall. It is the largest and outermost kuruwa of any castle.

;"Demaru":The "demaru" is a separate kuruwa placed to strengthen a vulnerable spot or structure within the castle. The buke shohatto limited (essentially prohibited) the construction of castle walls, leading to the development of large "daimyo gardens" in place of the "demaru".

;"Umadashi"

:The "umadashi" is a small kuruwa placed in front of the castle's entrance. In addition to simply making it difficult for the enemy to enter the castle grounds, it provides space for the defenders to repel the enemy with projectiles. It can also serve as a barracks for small parties of soldiers. This kuruwa can consist of any sort of wall from a shoddy earthwork fortification to large, strong walls as seen in Nagoya Castle, Sasayama Castle, and Hiroshima Castle.

;"Mizunote kuruwa":This refers to any kuruwa containing the castle's water supply.

Notes

Bibliography

*Norio, Nanjō and Tatsuya Naramoto. "Nihon no Meijō, Koten Jiten". TBS Britannica, 1989. ISBN 978-4484892085
*Rekishi Gunzō Henshūbu. "Rekishi Gunzō Tokuetsuhen-shū Yomigaeru Nihon no Shiro 26 Shiroezu wo Yomu". Gakken, 2005. ISBN ISBN 978-4056042337


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