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
South Army (German Empire) his place, General der Infanterie Felix Graf von Bothmer of II Bavarian Reserve Corps took command of the South Army. With the Russians withdrawing from the war (Treaty of Brest-Litovsk) and the run down of German forces on the Eastern Front, the army was dissolved on 25 January 1918. The headquarters of the army was located in Mukachevo (from 11 January 1915), Stryi (from 5 June 1915), Berezhany (from 4 September 1915), Khodoriv (from 15 November 1916) and Chortkiv (from 4 August 1917). The South Army had the following commanders during its existence: South Army (German Empire) The South Army