Assertion: fortress's tower | /r/HasProperty | crucial elements
Facets:
value: in illuminating the operation’s events
type: OTHER
Source sentences:
text: ’s bedroom; the tower, which had been outfitted as a defensive structure; and the location of a buried school bus that acted as an underground tunnel that would provide the last-stand fortress for the compound’s residents — were crucial elements in illuminating the operation’s events and outcomes.