Assertion: raven | /r/CapableOf | leave the tower
Facets:
Source sentences:
text: Legend has it that if the ravens ever leave the Tower, the British empire will fall.
text: The first reference to an early version of the legend that Britain will fall if the ravens leave the Tower comes from July 1944, when ravens were used as unofficial spotters for enemy bombs and planes during the Blitz of World War II.
text: The incident was reported in several newspapers, and some of the stories contained the first references in print to the legend that the British Empire would fall if the ravens left the tower.
text: The presence of ravens at the Tower is an echo of this legend and the prophecy says that if the ravens ever leave the tower, Britain will fall (hence their wings are clipped, just in case!).