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
Battle of Monastir (1917) Battle of Monastir (1917) The Battle of Monastir (1917) was a failed French attack against German-Bulgarian fortifications North and West of Monastir, between March 12 and May 26, 1917 during the Salonika Campaign in World War I. The battle, or, better said, series of operations, is known under several names. In French it is known as "Bataille de la cote 1248" (Battle of Hill 1248) and "Bataille de Pelister" (or Péristéri) after the Pelister mountain. In Bulgarian it is known as the "Battle of Chervena Stena", after the Chervena Stena or Crvena Stena ridge, also in the Pelister mountain range.