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An ōtsuchi (大槌, lit. large hammer or mallet) is a large wooden war mallet used by the samurai class of feudal Japan. The ōtsuchi had a shaft of about 6 feet (1.8 m) much like the ono (war axe). It was mainly used for door breaching.
The moment of the tsunami at otsuchi cho in iwate 3 11
References
Ōtsuchi Wikipedia(Text) CC BY-SA