Assertion: castle's fortification | /r/ObjectUse | used as basis
Facets:
value: for defences across the dover strait
type: PURPOSE
Source sentences:
text: Some coastal castles were used to support naval operations: Dover Castle's medieval fortifications used as basis for defences across the Dover Strait; Pitreavie Castle in Scotland was used to support the Royal Navy; and Carrickfergus Castle in Ireland was used as a coastal defence base.