Assertion: biological warfare's use | /r/HasProperty | established by medieval period
Facets:
value: well
type: DEGREE
Source sentences:
text: The use of catapults as weapons was well established by the medieval period, and projecting over the walls dead bodies of those dead of disease was an effective strategy for besieging armies.
text: The use of catapults as weapons was well established by the medieval period, and projecting over the walls dead bodies of those dead of disease was an effective strategy for besieging armies.