Bruising and Bleeding. Bruising or bleeding after an injury is normal. However, some people have disorders that cause them to bruise or bleed too easily. Sometimes people bleed without any obvious triggering event or injury.
The skin of victims of mustard gas blistered, the eyes became very sore and they began to vomit. Mustard gas caused internal and external bleeding and attacked the bronchial tubes, stripping off the mucous membrane. This was extremely painful and most soldiers had to be strapped to their beds.
The British were the first to respond. Raising Special Gas Companies in the wake of the Germans' April attack (of approximately 1,400 men) operating under the command of Lieutenant-Colonel Charles Foulkes, instructions were given to prepare for a gas attack at Loos in September 1915.