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The sashimono poles were attached to the backs of the chest armor (dou or dō) by special fittings. Sashimono were worn by common soldiers, known as ashigaru, to elite samurai, and in special holders on the horses of some cavalry soldiers. The banners, resembling small flags and bearing clan symbols, were most prominent during the Sengoku period—a period of long civil war in Japan from the middle 15th to early 17th century.
Given the great variety in Japanese armour, sashimono were used to provide a sense of “uniform” to the armies. The sashimono were typically black and white and came in either square or short rectangular forms, although many variations existed. A variation that is often bigger and coloured is the uma-jirushi, which were large, personalized, sashimono-like flags worn by commanders. Similar to this were the very large and narrow nobori banners, which commonly took two or three men to hold erect and were used to control the direction of fighting during large battles. (Uma-jirushi and nobori are still used today at sports events, as Japanese versions of the banners common among Western sports audiences.)
The banner hung from an L-shaped frame, which was attached to the chest armor dou or dō by a socket machi-uke or uketsubo near the waistline and hinged at shoulder level with a ring gattari or sashimono-gane. While this arrangement was perhaps one of the most common, there were other variations. Silk and leather were the most common materials used.
The designs on sashimono were usually very simple geometric shapes, sometimes accompanied by Japanese characters providing the name of the leader or clan, the clan's mon, or a clan's slogan. Often, the background colour of the flag indicated which army unit the wearer belonged to, while different divisions in these armies emblazoned their own design or logo on it. However, the presence of the daimyo's mon was used more commonly than the design or logo of the unit, as battles could often get quite large and complicated; being able to recognize friend from foe at a glance is of the utmost importance in battle. Sometimes elite samurai, who were sufficiently famed or respected, had their own personal design or name featured on their sashimono as opposed to that of their division. These stylized designs contrast with the elaborate heraldic devices displayed by some European armies of the same period.
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- Akira Kurosawa - Japanese film director who made a number of films set in this era, notable for their historically accurate costume design