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I don't have sufficient context to write an accurate overview of "1421." To provide you with a reliable 2-sentence description based only on what you've provided, I would need more information about what "1421" refers to—whether it's a book, historical event, theory, film, or something else entirely.
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Article
March 22: The English Army is defeated by French and Scottish troops in the Battle of Baugé.
Year 1421 (MCDXXI) was a common year starting on Wednesday of the Julian calendar.