There were several different types of weapons used during World War One. Both of the opposing forces were constantly looking for fresh new ideas that could help either side win the war. Finally, a new weapon was discovered that was more powerful than anyone at that time could have imagined. This new weapon was in the form of gas.
During the first months of the war, the French army started experimenting with some new ideas that they had. In August of 1914, the French army started to fire tear gas grenades at their opposing forces instead of starting with just normal firing. This proved to be somewhat successful for the French and the Germans started wondering what this new chemical was that was being thrown at them. When they finally figured out what was going on, they decided to also start experimenting with different forms of gases.
In the capture of Neuve Chapelle in October of 1914, the German army began firing shells at the French armies, which contained a chemical irritant whose result was to induce sneezing attacks. The Germans thought that maybe if the opposing army was
Since the war, the Armistice was created and the banning of poisonous gases began. To this day, this rule is still enforced and to my knowledge has not yet been broken. With the war on Iraq still going, gas warfare may someday still come into play.