Analysis of information sources in references of the Wikipedia article "Hand cannon" in English language version.
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In 1259 Chinese technicians produced a 'fire-lance' (huo ch' iang): gunpowder was exploded in a bamboo tube to discharge a cluster of pellets at a distance of 250 yards. It is also interesting to note the Mongol use of suffocating fumes produced by burning reeds at the battle of Liegnitz in 1241.
The other was the 'flame-spouting lance' (t'u huo ch'iang). A bamboo tube of large diameter was used as the barrel (t'ung), ... sending the objects, whether fragments of metal or pottery, pellets or bullets, in all directions
In 1259 Chinese technicians produced a 'fire-lance' (huo ch'iang): gunpowder was exploded in a bamboo tube to discharge a cluster of pellets at a distance of 250 yards. We are getting close to a barrel-gun.