Assertion: biological agent | /r/HasProperty | employed to limited extent
Facets:
value: during recent military conflicts
type: TEMPORAL
Source sentences:
text: Biological agents reportedly have been employed to a limited extent during recent military conflicts (for example, dispersion of plague bacilli during World War II and use of trichothecene mycotoxins ("yellow rain" in South East Asia); however, their use actually dates from antiquity.