The first use of the gas:
Poisonous gas was first used on a battlefield scale by the German amy on the 22nd April 1915 during the second battle of Ypres. They had transported tanks of liquid chlorine gas to the front line and released the gas upon the allied forces during a period of time when the wind was directly blowing in the direction of their trenches. When released the gas travelled to the allied trenches and a yellow coloured cloud. The effects of this gas were devastating to whoever inhaled it, destroying the victims respiratory system and causing them to choke to death.
Responses to the introduction of gas:
After the introduction of poisonous gas by the germans, other sides in the war saw great potential in the pioneered weapon. The allied forces, before creating a weaponised gas of their own, created effective gas masks and other precautions to helped protect against the german gas. The British were the first to respond to the German advancements, they launched their own chlorine attacks in September 1915. However it did not end all great for them because of a change in wind direction, it resulted in more than 2,000 British soldiers being struck by their own hand during the battle by the gas.
The progression of the gas:
As the war progressed so did the gas weaponry, deadlier gasses were created to be used in trench warfare and also more reliable delivery systems of the gas were introduced . By the year of 1917, chemical shells and mortars could now deposit the lethal gas through barrages upon enemy lines or territory. Phosgene gas was first introduced in late 1915, it was an almost invisible gas and with it being much more lethal than chlorine, it was much more desired. The Germans developed their own type of gas to be used in the battlefield which was mustard gas. It was first used in the summer of 1917 and served to be very affective. The reason why it was so effective was because the gas did not target the respiratory system but the skin and eyes its victims, this was revolutionary because it defeated the use existing gas masks and respirators that the enemy armies had created to protect against the first used chlorine gas.