Fighting and dying in choking prisons of green mist — Redefining the Rules of Engagement On April 22, 1915, at 5:30 am, Germany launched 5,000 chlorine-filled canisters onto the Allied forces in Ypres, Belgium. While British and French forces fought with determination, their efforts failed against the toxic effects of poison gas. The battle was a massacre for the British, with the death toll exceeding…