Assertion: tear gas | /r/ObjectUse | used in chemical warfare
Facets:
value: in world war i.
type: TEMPORAL
Source sentences:
text: Tear gas was first used in World War I in chemical warfare, but since its effects are short-lasting and rarely disabling, it came into use by law-enforcement agencies as a means of dispersing mobs, disabling rioters, and flushing out armed suspects without the use of deadly force.
text: Tear gas was used as a chemical weapon in World War I.