Japanese castle

Japanese castles, called 'Shiro' (城) in Japanese, were large fortresses composed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries, and came into their most well-known form in the 16th century. Like European castles, the castles of Japan were built to guard important (or strategic) sites, such as ports, river crossings, or crossroads, and almost always incorporated the landscape into its defense.

Though they were built to last, and used more stone in their construction than most Japanese buildings, castles were still constructed primarily of wood, and many were destroyed over the years. This was especially true during the later Sengoku, or 'Warring States' period, when many of these castles were first built. However, many were rebuilt, either during the Sengoku or Edo periods, or more recently, as national heritage sites or museums. Matsue Castle is probably the only castle in Japan to have never been attacked or suffer any damage, and what remains today is of the original structure, built in 1611. Hiroshima Castle, on the opposite end of the spectrum, was destroyed in the atomic bombing, and was rebuilt in 1958 as a museum.

The character '城', normally read as shiro, is read as jou when it is attached to a word, such as in the name of a particular castle. Thus, for example, Osaka Castle is called osaka-jou in Japanese.

History

Originally conceived of purely as fortresses, their primary purpose being military defense, Japanese castles came to be the homes of daimyo (feudal lords), and served to impress and intimidate rivals not only with their defenses, but with their size and elegant interiors, architecture and decorations. Oda Nobunaga was one of the first to build one of these palace-like castles, at Azuchi Castle in 1576; this was Japan's first castle to have a tower keep, and it inspired both Toyotomi Hideyoshi's Osaka Castle and Tokugawa Ieyasu's Edo Castle.

Prior to the Sengoku period (roughly, the 16th century), most castles were called yamashiro, or 'mountain castles'. Though most later castles were built atop mountains or hills, these were built from the mountains. Trees and the like were cleared, and the stone and dirt of the mountain itself was carved into rough fortifications. Ditches were dug, to present obstacles to attackers, as well as to roll rocks down. Moats were created by diverting mountain streams. Buildings were made primarily of wattle and daub, using thatched roofs, or, occasionally, wooden shingles. Small ports in the walls or planks could be used to fire bows or guns from. The main weakness of this style was its general instability. Thatch caught fire even more easily than wood, and weather and soil erosion prevented structures from being particularly large or heavy. Eventually, stone bases began to be used, encasing the hilltop in a layer of fine pebbles, and then a layer of larger rocks over that, with no mortar. This support allowed larger, heavier, and more permanent buildings, and led to the development of the castles this article focuses on, and which most would picture when thinking of 'Japanese castles'.

Unlike in Europe, where the advent of cannon spelled the end of the age of castles, Japanese castle-building was spurred, ironically, by the introduction of firearms. The Japanese used cannon very infrequently, due to the expense of obtaining cannon from foreigners, and the difficulty in casting such weapons themselves. A few castles boasted 'wall guns', but these are presumed to be little more than glorified arquebuses, lacking the power of a true cannon. The 16th century advents of the arquebus and cavalry charge could not be sufficiently defended against with wooden stockades, and so stone castles came into use.

Architecture & Defenses

Japanese castles were almost always built atop a hill or mound, and often an artificial mound would be created for this purpose. This not only aided greatly in the defense of the castle, but also allowed it a greater view over the surrounding land, and made the castle look more impressive and intimidating. In some ways, the use of stone, and the development of the architectural style of the castle, was a natural step up from the wooden stockades of earlier centuries. The hills gave Japanese castles sloping walls, which many argue helped (incidentally) to defend them from Japan's frequent earthquakes. However, this also made their walls easier to scale, so a number of other measures were invented to keep attackers off the walls, including pots of hot sand, gun emplacements, and arrow slits from which defenders could fire at attackers while still enjoying nearly full cover. Other tactics to hinder attackers' approaches to the walls included caltrops, bamboo spikes planted into the ground at a diagonal, or the use of felled trees, their branches facing outwards and presenting an obstacle to an approaching army.

Japanese castles, like their European cousins, featured massive stone walls and large moats. However, within the walls, a very different architectural style and philosophy applied. A number of wooden buildings lay within the walls, and in later castles, some of these structures would be placed atop smaller stone-covered mounds. To protect these wooden structures from the danger of an attacker lighting them on fire, a series of baileys, courtyards separated from one another by stone walls; an attacker would need to fight through several series of walls and gates to get to the primary keep.

See Also

• List of Castles
• Gusuku - the castles of Okinawa

References

• Turnbull, Stephen (1979). "Samurai Armies 1550-1615." Oxford: Osprey Publishing, Ltd.
• Turnbull, Stephen (2002). "War in Japan 1467-1615." Oxford: Osprey Publishing, Ltd.