Assertion: cluster bomb's use | /r/HasProperty | via air-dropped bombs
Facets:
value: in world war ii
type: TEMPORAL
Source sentences:
text: It has been widely used in both the air and ground role, with the largest use to date being via air-dropped bombs in World War II (most notably in the devastating incendiary attacks on Japanese cities in 1945), and later close air support roles in Korea and Vietnam.