This is a very old gun. 
Long ago, people made the first small guns. 
The hand cannon was the first true firearm. It was a simple metal tube. 
Hand cannons were used in China during the 13th century. They spread to other lands soon after. In 1287, troops used them in a big battle. These guns caused much confusion for the enemy. Some soldiers even carried them on their backs. 
To fire a hand cannon, you needed a touch hole. This is a small hole in the metal. You had to touch the hole with a hot item. You might use hot coal or a slow fire. This made the powder inside go bang. The blast shot things out of the tube. These things could be rocks or lead balls. 
The hand cannon was the very first true firearm. It was a simple metal tube used to shoot things.
To make a hand cannon work, you had to fire it by hand. It did not have a trigger like a modern gun. Instead, it had a small opening called a touch hole. 
These weapons grew from older tools called fire lances. 
Hand cannons were used widely in China starting in the 13th century. 
Over time, these simple tools became much more advanced. In 15th-century Europe, the hand cannon evolved into the arquebus. The arquebus was a new kind of firearm that finally had a trigger. 
The hand cannon represents the first true firearm in human history. It is considered the oldest type of small arms ever made. It also serves as the most mechanically simple form of metal-barreled firearm.
To understand how it works, you must look at its manual ignition process. Unlike a matchlock firearm, it lacks a trigger or a firing mechanism. Instead, the weapon features a small opening known as a touch hole. 
The hand cannon evolved from much older gunpowder tools called fire lances. In 1259, a version called a "fire-emitting lance" appeared in China. These early versions used large bamboo tubes rather than metal. They were stuffed with a pellet wad, which may be the first true bullet in history. Because the wad filled the tube, it helped direct the force of the blast. Eventually, builders switched from bamboo, wood, or paper to metal barrels. Metal was necessary to withstand the intense explosive pressure of the gunpowder. 
Historical records show that hand cannons saw widespread use in China during the 13th century. In 1287, Yuan Jurchen troops used them to suppress a rebellion by the Mongol prince Nayan. These weapons caused great damage and massive confusion among enemy soldiers. By 1288, soldiers known as "gun-soldiers" could even carry these cannons on their backs. This era also saw a shift in terminology. People began using the term "chong" to describe metal-barrel firearms. This replaced the older, more vague term "huotong," which meant fire tube. 
As time passed, these weapons spread across the vast continent of Eurasia. By the 14th century, hand cannons were used throughout much of the world. In Europe, the earliest reliable evidence appears in a 1326 register from Florence. By 1338, hand cannons were already in widespread use in France. In the Middle East, different scholars debate exactly when they arrived. Some suggest Mamluk forces used them as early as 1260. Others believe they did not appear in the Islamic world until the 14th century. 
Specific archaeological finds provide us with exact dates for these early weapons. The Xanadu Gun is the oldest surviving hand cannon with a recorded production date. It contains an era date that corresponds to the year 1298. Another specimen, the Heilongjiang hand cannon, is estimated to be from 1288. While some other cannons may be even older, they lack official inscriptions. In Japan, the introduction of firearms was a later event. While the Mongols brought gunpowder knowledge in the 13th century, a monk did not bring a cannon to Japan until 1510. It was not until 1543 that the Portuguese introduced matchlocks to the islands.
The design of the hand cannon was quite basic but functional. It typically consisted of a metal barrel and a handle. Some models included a socket to attach a wooden stock for better stability. Because they were difficult to fire, a second person often helped with the ignition. The gunner could also place the weapon on a rest to steady it. In the late 15th century, these simple tools underwent a major transformation. Improvements in gunpowder, such as "corned powder," and the invention of the flash pan led to the arquebus. The arquebus was the first firearm to feature a trigger, marking the end of the hand cannon era.
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