Hwacha or Hwach'a is the world's first multiple rocket launcher

Multiple rocket launcher

A multiple rocket launcher is a type of unguided rocket artillery system. Like other rocket artillery, multiple rocket launchers are less accurate and have a much lower rate of fire than batteries of traditional artillery guns...

 developed and used in Joseon

Joseon

Joseon, Chosŏn, Choseon or Chosun are English spellings of the Korean *word for "Korea". It may refer to:*Korea*Gojoseon, the first Korean kingdom, from 2333 BC to 108 BC.*Joseon Dynasty of Korea, from AD 1392 to 1910....

 Korea

Korea

Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

. It had the ability to fire up to 100 steel-tipped rocket

Rocket

A rocket is a missile, spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine. In all rockets, the exhaust is formed entirely from propellants carried within the rocket before use. Rocket engines work by action and reaction...

s, or 200 Singijeon

Singijeon

Singijeon or Shinkichon is a multi-launch rocket invented by Korean general Choe Mu-seon in 1377, during the Goryeo Dynasty under King U...

 ("divine weapon") flaming arrow projectiles from a range of 500 yards in multiple salvo

Salvo

A salvo is the simultaneous discharge of artillery or firearms including the firing of guns either to hit a target or to perform a salute.Troops armed with muzzleloaders required time in which to refill their arms with gun powder and shot...

s. Its prototypes were developed as a secret weapon in the 15th century under King Sejong the Great.

The weapon consisted of a two-wheeled cart carrying a board filled with holes into which the ammunition was inserted.