Mustard Gas

Mustard Gas
The First World War also saw the use of chemical warfare and aerial bombardment, both of which had been outlawed under the 1907 Hague Convention.
Chemical warfare was a major distinguishing factor of the war. Gases used ranged from tear gas to disabling chemicals such as mustard gas and killing agents like phosgene. Only a small proportion of casualties were caused by gas, but it achieved harassment and psychological effects. Effective countermeasures to gas were found in gas masks and hence in the later stages of the war, as the use of gas increased, in many cases its effectiveness was diminished.

Mustard gas was used during World War I. Mustard gas was used to kill or leave injured people. Some people didn't get injured too much but they had skin diseases. How was mustard gas important? Mustard gas was used to kill people or injure them.