The Gas attacks Attack at Wulverghem ( 30 April and 17 June 1916 ) were German cloud gas releases during the First World War on British troops in the municipality of Heuvelland , near Ypres in the Belgian province of West Flanders .

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 .

The German gas attack Attack at Wulverghem on 30 April , caused Causation the defenders casualties Bodily_harm and fatalities Death but German raiding Attack parties , looking for mine entrances Arriving to destroy Destroying , were repulsed Defending with small-arms and artillery fire .