Katyusha rocket launcher
Katyusha multiple rocket launchers (Russian: Катю́ша; IPA: [kɐˈtʲuʂə] ( listen)) are a type of rocket artillery first built and fielded by the Soviet Union in World War II. Multiple rocket launchers such as these deliver explosives to a target area more quickly than conventional artillery, but with lower accuracy and requiring a longer time to reload. They are fragile compared to artillery guns, but are inexpensive, easy to produce, and usable on any chassis. Katyushas of World War II, the first self-propelled artillery mass-produced by the Soviet Union, were usually mounted on ordinary trucks. This mobility gave the Katyusha (and other self-propelled artillery) another advantage: being able to deliver a large blow all at once, and then move before being located and attacked with counter-battery fire.
Additional Information: en.wikipedia.org/wiki/Katyusha_rocket_launcher