Assertion: fortress | /r/HasProperty | built in rivermouth
Facets:
value: previously
type: TEMPORAL
value: to defend against ships
type: PURPOSE
Source sentences:
text: Previously, forts had been built in rivermouths and similar locations to defend against ships, such as the Grain Tower Battery at the mouth of the Medway dating from 1855, Plymouth Breakwater Fort, completed 1865, the four Spithead Forts: