world war 1 was mad war.

One interesting fact about World War I is that it was the first major conflict to extensively use chemical weapons. Both sides, the Allies and the Central Powers, employed various toxic gases such as chlorine, phosgene, and mustard gas during the course of the war. These chemical weapons caused significant suffering and casualties among soldiers, leading to the development of international agreements prohibiting their use in later conflicts. The use of chemical weapons in World War I marked a grim chapter in the history of warfare and spurred efforts to regulate and ban their use in subsequent conflicts.