Assertion: castle's fortification | /r/HasProperty | common
Facets:
Source sentences:
text: Steel-and-concrete fortifications were common during the 19th and early 20th centuries.
text: Steel-and-concrete fortifications were common during the 19th and early 20th centuries.
text: Steel-and-concrete fortifications were common during the 19th and early 20th centuries.
text: Steel-and-concrete fortifications were common during the 19th and early 20th centuries.