On the Gas Alert

Charcoal sketch on white paper of American soldiers American soldiers huddled in a trench, presumably getting ready for battle and preparing for a gas attack. Some soldiers are wearing gas masks, while others peek over the trench walls. In the background at right there is an overturned tank behind a dead horse. There is barbed wire in the background on the left. Toxic gasses, such as chlorine and mustard gas, were used in World War I by enemy armies as part of chemical warfare. When gas was detected, an alarm was raised and soldiers would put on their gas masks to avoid injuries, such as chemical burns and blindness, or death.