When chemical weapons killed 90,000
Written by Paul Schulte. World War I ushered in an era of chemical weapons use that lingers, lethally, into the present day. Indeed, the German chlorine attacks against French, Algerian, British and Canadian troops around Ypres -- site of the war's most relentless fighting -- in April 1915 presaged a world in which weapons of mass destruction became at least a permanent background anxiety and often a source of intense terror.