Kaiu Mozi was a Crab Clan samurai. Mozi lived in the time of the Battle of White Stag. After the battle, Hantei Muhaki banned the use of gaijin polvora, but did not ban the crossbow. Mozi was fascinated by the weapon and developed a larger model, known as the Oyumi, for siege warfare. Mozi also developed several variants of the oyumi. Since that time the name oyumi has been applied to the regular crossbow as well.[1]


  1. The Complete Exotic Arms Guide, p.44

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