Assertion: fortress's tower | /r/HasProperty | placed at strategic places
Facets:
value: to provide flanking protection
type: PURPOSE
value: along the curtain wall
type: LOCATION
Source sentences:
text: Tower - defensive towers were placed at strategic places along the curtain wall (corners, changes of direction, mid-wall) to provide flanking protection; at first mostly square, they were built round as time went on with a resulting better field of fire.