Chemical Warefare
During World War I, chlorine and phosgene gases were released from canisters on the battlefield and dispersed by the wind. These chemicals were manufactured in large quantities by the turn of the century and were deployed as weapons during the protracted period of trench warfare. The first large-scale attack with chlorine gas occurred 22 April 1915 at Ieper in Belgium. The use of several different types of chemical weapons, including mustard gas (yperite), resulted in 90,000 deaths and over one million casualties during the war. Those injured in chemical warfare suffered from the effects for the rest of their lives; thus the events at Ieper during World War I scarred a generation. By the end of World War I, 124,000 tonnes of chemical agent had been expended. The means of delivery for chemical agent evolved over the first half of the twentieth century, increasing these weapons’ already frightening capacity to kill and maim through the development of chemical munitions in the form of artillery shells, mortar projectiles, aerial bombs, spray tanks and landmines.