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A chain weapon is a weapon made of one or more heavy objects attached to a chain, sometimes with a handle. The flail was one of the more common types of chain weapons associated with medieval Europe, although some flails used hinges instead of chains.
Various chain weapons were used in feudal Japan. Recognised fighting arts with such weapons include gekigan-jutsu (using a ball and chain), chigiriki-jutsu (using a ball and chain on a short stick), and kusarigama-jutsu (employing a chain-ball-sickle weapon). Ninja were expert at handling kusari-gama, the composite sickle and chain with a ball being small enough to be easily concealed, and which was used to haul an enemy close enough to be dispatched by a thrust or slash of the razor-sharp kama. The shoge was a ring with a sickle-like knife on a chain that could be used to pierce armor, grapple, and to entangle the legs of man and horse. The chigriki was a staff with a weighted chain on the end. The manriki-gusari was a double weighted chain. The nunchaku was a short chain with two short wooden sticks on the ends, although it was principally a farming tool rather than a weapon, at least until much later.