'A kind of Rosetta Stone': AI decodes 217-year-old secret letter ordered by Napoleon

An AI model decoded an unsolved 1809 homophonic cipher sent on Napoleon's orders to Marshal Auguste de Marmont. The system used a partial historical code table found through web research to map the remaining symbols and translate the full text. Historians and linguists gain a tested key that may help decipher other military correspondence from the period.

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