Assertion: castle's wall | /r/HasProperty | two feet thick
Facets:
value: at their base
type: LOCATION
value: at the bottom
type: LOCATION
Source sentences:
text: The walls of Montezuma Castle were two feet thick at the bottom and narrowed to one foot thick at the top.
text: Timber was shipped in from Liverpool, Rhuddlan, and Conway, and labourers began to cut the moat - this also supplied the rock for the walls (which were twenty foot thick at their base).