Katyusha rocket

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While the German Nebelwerfer was the first multiple rocket launcher used operationally in the Second World War, the Soviet 130mm Katyusha rocket was the most widely used, and has become a generic term for a medium-sized unguided rocket used in indirect fire. In the original use, the rockets were fired from 12-rocket mounts on trucks, which operated in battalions of 18 trucks.

They could, however, be fired individually, with very little accuracy but great portability; guerillas could put them in a crude trough launcher, connect the rocket igniter to a time fuze, and be long away from the launching site when the rocket fired into the general area of the target. This technique is used by Palestinian guerillas attacking Israeli targets.

Individual rockets of this type are quite inaccurate in comparison to howitzers, but in conventional military use, the inaccuracy became an advantage. Typically all the launchers of a battalion would fire at once, and the wobbling rockets would spread out to put blast and fragmentation over a large area. Traditional cannon artillery were more accurate and put more intense blast in a smaller area; the functions were complementary.

Eventually, the Katyusha was replaced by the more efficient 122mm GRAD rocket, which gave longer range and higher density of target coverage.