11. The First Use of Chlorine Gas – April 22, 1915
On this grim day at Ypres, German troops released clouds of chlorine gas across Allied trenches, forever changing the face of warfare. The world witnessed the dawn of chemical weapons, sparking horror and urgent debates over ethics and legality. This act not only altered military strategy but also led to new international treaties and a heightened awareness of the horrors of modern conflict. Discover more about chemical warfare’s origins here.
