Question

click to correct any capitalization errors.
lasting from 1337 until 1453, the hundred years war was a series of ongoing battles and disputes between the english and the french.
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Explanation:

Common nouns that are not part of a proper name do not need capitalization. "Battles" and "Disputes" are general common nouns here, not formal proper titles, so they should be lowercase.

Answer:

Lasting from 1337 until 1453, the Hundred Years' War was a series of ongoing battles and disputes between the English and the French.