Assertion: field fortification | /r/HasProperty | constructed in the united kingdom
Facets:
Source sentences:
text: From this and other surveys, it is estimated that some 28,000 pillboxes and other hardened field fortifications were constructed in the United Kingdom, of which about 6,500 still survive.
text: About 28,000 pillboxes and other hardened field fortifications were constructed in the United Kingdom of which about 6,500 still survive.