UK History: Chapter 5, Exercise 2 — Possible Solution
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CORRECTION
The conflict spanned 1337 to 1453, about 116 years, and was intermittent, so
it did not last exactly a hundred years, and it was not continuous fighting.

REWRITE
"The Hundred Years' War ran intermittently from 1337 to 1453, about 116 years,
in three phases."

CAUTION
The chapter does not cover where the name comes from.