The Second Battle of Ypres, which took place from April 22 to May 25, 1915, in the Ypres Salient in Belgium, saw a notable escalation in the methods of warfare as German forces employed chlorine gas for the first time on the Eastern Front. This offensive began on the evening of April 22, as German troops released the toxic gas over a line approximately four miles long, catching Allied soldiers off guard. The gas, consisting of chlorine, created confusion and terror as it caused severe respiratory damage and death, significantly affecting the morale and combat effectiveness of the Allied forces. Despite its devastating effects, the gas attack also prompted improvements in defensive measures and gas mask technology.The use of poison gas during this battle was unprecedented and its implementation highlighted both the technological advancements and moral dilemmas of modern warfare. The Allies, notably British forces, suffered heavy casualties, with estimates suggesting that approximately 5,000 soldiers were killed or incapacitated within the first 10 minutes of the gas attack. The battle continued for several weeks, with various tactical maneuvers undertaken by both sides. Interestingly, although the gas proved to be effective initially, the weather conditions played a role in limiting further gas attacks throughout the conflict, showcasing that environmental factors could influence modern warfare decisions.