Assertion: fortress | /r/CapableOf | provide defence
Facets:
value: in depth
type: OTHER
value: with tiers of defences
type: OTHER
Source sentences:
text: Compared to medieval fortifications, forts became both lower and larger in area, providing defence in depth, with tiers of defences that an attacker needed to overcome in order to bring cannon to bear on the inner layers of defences.