A wooden cannon was a lightweight, makeshift cannon carved out of oak or cherry wood and bound with rope or crude metal rings. In situations where metal for forging cannons was scarce or not enough time was available, wooden cannons acted as serviceable substitutes, launching simple balls of clay which carried a level of destructive force comparable to a real cannon. In keeping with their makeshift nature, however, wooden cannons were prone to breaking after just a few - or, in some cases, one - shots. Historically, wooden cannons were used during the Boshin war.
In Rurouni Kenshin, a wooden cannon appears in the possession of the Hishimanji Guren Gang and was used in the gang's siege on the Kamiya dojo. It was fired only once, but its clay projectile was cut in half and deflected by the dojo's acting protector, Himura Kenshin.