Kaiu no Oyumi

Kaiu no Oyumi was developed within the 12th century by Kaiu engineers. It was a large, bulky weapon, essentially a rapid-fire oyumi. The Kaiu no oyumi consisted of a heavy oyumi with a large box attached to the top of the stock. The box contained a magazine of bolts and a cocking mechanism that, with a single pull, drew the string, loaded a bolt, and readied the mechanism to fire. This rare weapon had proven very valuable in extended engagements on the Kaiu Wall, allowing small numbers of soldiers to face down numerically superior foes while awaiting reinforcements.