Assertion: mortar bomb | /r/ObjectUse | used by american
Facets:
value: to a lesser extent
type: DEGREE
value: extensively
type: DEGREE
value: during world war i
type: TEMPORAL
Source sentences:
text: During World War I, white phosphorus mortar bombs, shells, rockets, and grenades were used extensively by American, Commonwealth, and, to a lesser extent, Japanese forces, in both smoke-generating and antipersonnel roles.