Assertion: castle's gate | /r/HasProperty | protected by barbican
Facets:
value: to form an echelon
type: PURPOSE
Source sentences:
text: Particular attention would be paid to defending entrances, with gates protected by drawbridges, portcullises, and barbicans.
text: The gates were each additionally protected by a barbican consisting of two walls to form an echelon overlooking a pit.