Huochong (Traditional Chinese: 火銃；Simplified Chinese: 火铳) is a tube-like, projection firearm. It first appeared in the Song Dynasty and was constructed of bamboo. Also, some discovering of the dai viet of use of it. The bamboo body was replaced with bronze sometime in the late 13th or early 14th century. The oldest metal huochong, which is seen by many as the first known cannon, is a bronze huochong which has an inscription dating back to 1298. This piece has no certain find context, however, and is therefore disputed in authenticity. The first certain bronze huochong comes from 1332. The dai viet had used this weapon in couple of battles against Chinese and champa forces.