An arquebus is like a really old gun that people used a long time ago. In Vietnam, they used the arquebus in battles many years ago because it was a new and powerful weapon at the time.
When someone fired an arquebus, they had to first put in gunpowder, then a piece of wadding, and a bullet. They would then light a piece of string called a match and hold it to a small hole on the side of the gun called a touchhole. This would cause the gunpowder to ignite and send the bullet flying out of the end of the gun.
The Vietnam arquebus was unique because it was made from a bamboo tube rather than metal like other arquebuses. This made it easier to carry because it was lighter, but it also meant that it was not as strong as metal arquebuses.
People who used the Vietnam arquebus in battles had to be very careful. They had to make sure that the gunpowder was not wet because if it was, the gun would not fire. They also had to be careful not to get their fingers too close to the touchhole when lighting the match because it could burn them.
Overall, the Vietnam arquebus played an important role in battles in Vietnam a long time ago. It was a powerful weapon that helped people fight for their homes and their freedom.