Editing Rocket launcher (section)

===World War II===
[[File:Katyusha Rocket Launcher - Artillery Museum - St. Petersburg - Russia.jpg|thumb|right|A [[World War II]] [[Katyusha rocket launcher|''Katyusha'' rocket launcher]], mounted on a [[ZiS-6]] truck.]]
Pre-war research programmes into military rocket technology by many of the major powers led to the introduction of a number of [[rocket artillery]] systems with fixed or mobile launchers, often capable of firing a number of rockets in a single [[salvo]]. In the United Kingdom, [[solid fuel rocket]]s were initially used in the [[anti-aircraft warfare|anti-aircraft]] role; the 7-inch [[Unrotated Projectile]] was fired from single pedestal-mounted launchers on warships and a 3-inch version was used by shore based [[Z Battery|Z Batteries]], for which multiple "projectors" were developed. Later developments of these weapons included the [[Land Mattress]] multiple launchers for surface-to-surface bombardment and the [[RP-3]] air-to-ground rockets that were launched from rails fitted to [[fighter bomber]] aircraft. In Germany, the [[15 cm Nebelwerfer 41]] was an adaptation of a multiple barrelled smoke [[mortar (weapon)|mortar]] for artillery rockets. The [[USSR|Soviet]]{{'}}s [[Katyusha rocket launcher|''Katyusha'']] was a self-propelled system, being mounted on trucks, tanks and even trains. The [[United States Army]] deployed the tank mounted [[T34 Calliope]] system late in the war.<ref>Bishop, Chris (2002), [https://archive.org/stream/tractors-29177010-Encyclopedia-of-Weapons-of-World-War-II/29177010-Encyclopedia-of-Weapons-of-World-War-II#page/n165/mode/2up ''The Encyclopedia of Weapons of World War II''], Metrobooks, {{ISBN|978-1586637620}} (pp. 169-178)</ref>