Sulfur mustard later also against the French Second Army. The name Yperite comes from its usage by the German army near the town of Ypres. The Allies did not use mustard agent until November 1917 at Cambrai, France, after the armies had captured a stockpile of German mustard shells. It took the British more than a year to develop their own mustard agent 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 of the Hindenburg Line. Mustard agent was dispersed
British home army in the First World War the New Army over the Territorial Force. Fear of invasion persisted throughout the first months of the war; Kitchener's decision was motivated in part by his concern that the Territorial Force should not be diverted from what he regarded as its primary task of defending the homeland. German success on the continent in September and October opened up the prospect of the French channel ports being used to launch an invasion that could outflank the main British coastal defences north of the Thames. To allow rapid redeployment of the Central Force across the river, construction was begun on a pontoon