The Katyusha was a multiple rocket launcher used by the Soviet Union

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The Katyusha is 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 intensively than conventional artillery, but with lower accuracy and requiring a longer time to reload.
The Katyushas of World War II, the first self-propelled artillery mass-produced by the Soviet Union, were usually mounted on ordinary trucks.