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
Gas Mark Gas Mark The Gas Mark is a temperature scale used on gas ovens and cookers in Great Britain, Ireland and some Commonwealth of Nations countries. The draft 2003 edition of the "Oxford English Dictionary" lists the earliest known usage of the concept as being in L. Chatterton's book "Modern Cookery" published in 1943: "Afternoon tea scones… Time: 20 minutes. Temperature: Gas, Regulo Mark 7". "Regulo" was a type of gas regulator used by a manufacturer of cookers; however, the scale has now become universal, and the word "Regulo" is rarely used. The term "gas mark" was a subject of the