The Hundred Years' War between England and France actually lasted for 116 years.
Why it is true
It was a series of conflicts fought from 1337 to 1453. It spanned three centuries and involved five generations of kings from two rival dynasties.
Source: History
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.