The Nebelwerfer ("Smoke Mortar"[1] literally "Fog thrower") was a World War II German series of weapons originally designed to deliver chemical weapons.[citation needed] They were initially developed by and assigned to the Wehrmacht's so-called Chemical Troops (Nebeltruppen). This weapon was given its name as a disinformation strategy designed to lead spies into thinking that it was merely a device for creating a smoke screen.[citation needed] They were primarily intended to deliver poison gas and smoke shells,[citation needed] although a high-explosive shell was developed for their Nebelwerfers from the beginning. Initially two different mortars were fielded before they were replaced by a variety of rocket launchers ranging in size from 15 to 32 centimetres (5.9 to 13 in). The thin walls of the rockets had the great advantage of allowing much larger quantities of gases, fluids or high-explosive to be delivered than artillery or even mortar shells of the same weight. Nebelwerfers were used in every campaign of the German Army during World War II with the exception of the Balkans Campaign. One rocket was even adapted for air-to-air use against Allied bombers. The name was also used to fool observers from the League of Nations, who were observing any possible infraction of the Treaty of Versailies, from discovering that the weapon could be used for explosive and toxic chemical payloads as well as the smoke rounds the name Nebelwerfer suggests.
After the crew had loaded and aimed the launcher, they had to take cover 10 to 15 metres (11 to 16 yd) away to avoid the exhaust flames, and would fire the rockets with an electric switch. After firing, however, a long streak of smoke was visible from a considerable distance, leaving the Nebelwerfer vulnerable to counter-battery fire. It was therefore necessary to relocate the launcher and crew as soon as possible after firing.[12] The loud, shrill howling noise of the incoming rockets led American soldiers in the Sicily campaign to give it the nicknames "Screaming Meemie" and "Moaning Minnie".
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