Assertion: fortress's wall | /r/HasAspect | a thickness of about 3 m
Facets:
value: with numerous watch-towers
type: OTHER
value: with its iron gates
type: OTHER
Source sentences:
text: When intact, the wall had a height of 9 m (29 ft) and a thickness of about 3 m (10 ft) and, with its iron gates and numerous watch-towers, defended Persia's frontier.