Introduction
Poison gas was a significant weapon used during World War I, causing widespread casualties and changing the face of modern warfare.

The first major use of poison gas was by the German army on April 22, 1915, at the Second Battle of Ypres. They released chlorine gas, which caused severe respiratory problems and led to the deaths of many soldiers.
Types of Poison Gas
Several types of poison gas were used during World War I, including:
- Chlorine gas
- Phosgene gas
- Mustard gas
Each type of gas had different effects on the human body, ranging from respiratory issues to severe blistering and death.
Impact of Poison Gas
The use of poison gas had a significant psychological and physical impact on soldiers. It led to the development of new protective gear, such as gas masks, and changes in military tactics.
For more information on related topics, you can visit the World War I or Trench Warfare pages.