18 July 2024

Iraq once devastated Iran with chemical weapons as the world stood by. Governments still struggle to respond to chemical warfare

Peyman Asadzade

In April 1915, the German army tried a new tactic to break through allied trenches on the front lines of World War I: the first large-scale use of poison gas. It was a devastating attack on the unprepared allies, and as the heavier-than-air chlorine gas cloud passed over their lines, 1,100 unprotected soldiers died and others retreated, hacking and desperate for air. Although the Germans were slow to press their advantage, the gas had its intended effect and cleared miles of trenches where allied troops had previously stood guard.

Although successful on the surface, the gas attack at the Second Battle of Ypres, a city in Belgium, also highlighted the operational drawbacks of chemical weapons. Targeting an adversary with a weapon that can be dispersed by the whim of the weather and having it reach a target in sufficient quantities without blowing back on the attacking forces is no simple matter. It requires careful observation of the winds and precise placement of the weapons. At Ypres, chemist and future Nobel Prize-winner Fritz Haber, who had advocated for Germany’s use of the poison gas, was personally on hand to manage the placement of thousands of gas canisters. When the allies followed Germany’s example and began engaging in chemical warfare themselves, the overall effect was mixed. At the Battle of Loos, about six months after Ypres, a British chlorine gas attack blew back on the attackers.

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