Chemical weapons in World War I in Palestine during the Second Battle of Gaza. Russia began manufacturing chlorine gas in 1916, with phosgene being produced later in the year. Most of the manufactured gas was never used. The British Army first used mustard gas in November 1917 at Cambrai, after their armies had captured a stockpile of German mustard gas shells. It took the British more than a year to develop their own mustard gas weapon, with production of the chemicals centred on Avonmouth Docks. (The only option available to the British was the Despretz–Niemann–Guthrie process). This was used first in September 1918 during the breaking
German Army (German Empire) German Army (German Empire) The Imperial German Army () was the name given to the combined land and air forces of the German Empire (excluding the ' maritime aviation formations of the Imperial German Navy). The term ' is also used for the modern German Army, the land component of the ". The German Army was formed after the unification of Germany under Prussian leadership in 1871 and dissolved in 1919, after the defeat of the German Empire in World War I. The states that made up the German Empire contributed their armies; within the German Confederation, formed after the