Chemical weapons in World War I volatile oily liquid. It was introduced as a vesicant by Germany in July 1917 prior to the Third Battle of Ypres. The Germans marked their shells yellow for mustard gas and green for chlorine and phosgene; hence they called the new gas "Yellow Cross". It was known to the British as "HS" ("Hun Stuff"), and the French called it "Yperite" (named after Ypres). Mustard gas is not an effective killing agent (though in high enough doses it is fatal) but can be used to harass and disable the enemy and pollute the battlefield. Delivered in artillery shells, mustard gas was
History of the German Army Aviation Corps History of the German Army Aviation Corps The history of the German Army Aviation Corps goes back to the time when the German Wehrmacht first began to develop helicopters. The first helicopter flight in Germany took place on 26 June 1936 with a Focke-Wulf Fw 61. The Focke-Wulf Fw 61 was, however, an experimental helicopter and only two examples were ever built. Yet, Ernst Udet, head of the Reich Air Ministry development wing, having seen the demonstration flights, became a proponent of this relatively new type of aircraft. During World War II, several types were considered to be procured for