British war crimes September 1915 and continued their usage for the remainder of the war. This was done in retaliation for the use of chlorine by Imperial German Army the preceding April. Following the Imperial German Army's use of poison gas at Ypres, the commander of II Corps, Lieutenant General Sir Charles Ferguson, had said of poison gas: Mustard gas was first used effectively in World War I by the German army against British and Canadian soldiers near Ypres, Belgium, in 1917 and later also against the French Second Army. The name "Yperite" comes from its usage by the German army near the
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.