What happened in World War 1 gas attack?

In World War I, gas attacks were introduced as a new form of warfare, with chlorine gas being first used by Germany in 1915. These attacks caused severe injuries, psychological trauma, and high mortality rates among soldiers, as the gas could cause choking, blistering, and long-term health issues. Subsequent gases, like phosgene and mustard gas, were developed, leading to widespread Horror and prompting the eventual establishment of gas masks and protective measures. The use of chemical weapons in the war marked a significant and controversial chapter in military history, raising ethical concerns that persist today.