Assertion: phosgene | /r/ObjectUse | used as choking war gas
Facets:
value: during world war i
type: TEMPORAL
Source sentences:
text: During World War I, phosgene was used as a choking war gas.
text: During World War I, phosgene was used as a choking war gas.
text: During World War I, phosgene was used as a choking war gas.