 The fire lance or fire tubea combination of a firearm and flamethrowerhad been adapted and changed into several different forms by the time Jiao Yu edited the "Huolongjing".The earliest depiction of a fire lance is dated c. 950, a Chinese painting on a silk banner found at the Buddhist site of Dunhuang.These early fire lances were made of bamboo tubes, but metal barrels had appeared during the 13th century, and shot gunpowder flames along with "coviative" projectiles such as small porcelain shards or metal scraps.