Ninjaken
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Template:Mergeto The Ninjaken (忍者剣) (also called shinobigatana) is the more correct term for "ninjato," or the sword a ninja would have carried. According to the book "Ninjutsu History and Tradition" by Masaaki Hatsumi, Soke (Headmaster) of the Bujinkan Dojo system, these swords came in a variety of shapes and sizes. Often, however, they were much shorter than the traditional daito katana used by the samurai of feudal Japan.
The typical shinobigatana carried by a ninja would most likely have been a wakizashi or cut-down katana, fitted with a katana-length handle and placed in a katana-length saya (scabbard). This may have been used to deceive one's opponents into miscalculating how quickly it could be drawn, allowing one to use an Iaijutsu strike faster than expected. It also disguises the weapon (that would easily identify them as a ninja) as a common sword. The extra space in the saya may also be used to store or hide other equipment or goods. Of course, a shorter blade forces the fighter to get closer to his opponent, which would be a definite disadvantage when facing samurai armed with full length swords, and doubly so in an iai duel when, to enhance chances of striking first, you'd draw as soon as your blade's length allowed, and make full use of its slashing ability, while a shorter blade tends to be used in a more stabby style.
Modern ninjato are often straight with a square tsuba (hand guard), but this is not historically accurate. According to the same book by Masaaki Hatsumi, the ninja ken was straight, but only in contrast to the average sword of the period which were much more curved. The ninja ken still had a slight curve to the sword. Hatsumi says that they were often straight bars of low-quality steel with an edge ground on to them. According to other sources, some of the sword being forged during the Tokugawa era also had blades with less curvature than others. This was also the period during which the mythology of the ninja grew as they were employed by the Shogun as secret police.
The Bujinkan dojo currently contains one school, the Togakure ryu, which teaches the use of the ninja ken. Typically, this is a wakizashi-length sword (or slightly longer) that has been outfitted with katana sized koshirae (fittings). The idea behind a shorter sword is that it is much easier to fight in close quarters with a shorter sword, as would be necessary for a ninja acting as an intelligence-gatherer.
See also NinjatoTemplate:Weapon-stub