Assertion: mortar | /r/CapableOf | prove to be useful weapon
Facets:
value: especially
type: MANNER
value: subsequently
type: TEMPORAL
Source sentences:
text: Subsequently, the mortar proved to be an especially useful weapon in areas of rough terrain such as mountains and jungle, into which artillery pieces could not be moved.
text: Subsequently, the mortar proved to be an especially useful weapon in areas of rough terrain such as mountains and jungle, into which artillery pieces could not be moved.