What is Chlorine Gas and how to protect yourself from it

Chlorine gas (CL2) was the very first chemical weapon used efficiently in World War One. Chlorine gas is as the name applies a gas/vapour version of chlorine, once chlorine gas is inhaled it reacts with water in the body, causing chemical burns to the lungs, throat and eyes, in high concentration it can cause chemical burns to the skin, at least 5000 soldiers were killed by chlorine gas during the first world war, however the invention and adoption of gas masks/respirators quickly lead to chlorine gas being