The gas used Using by the German troops at Hulluch was a mixture of chlorine and phosgene , which had first been used Using on 19 December 1915 at Wieltje , near Ypres .

The battle Hostile_encounter also marked Recording the first use Using of chlorine bombs by insurgents during the war Military_operation .

On October 21 , 2006 , insurgents detonated Committing_crime a car-bomb with two 100-pound chlorine tanks , injuring Bodily_harm three Iraqi policemen and a civilian in Ramadi .

The gas used Using at Wulverghem was a mixture of chlorine and phosgene , which had been used Using against British troops on 19 December 1915 in the phosgene attack Attack at Wieltje , north-east of Ypres .

Helmets impregnated with chemicals to neutralise Cure chlorine had been issued Supply in several variants , each more effective than the last .