The document was not a letter written directly by Napoleon. It originated at the headquarters of Eugène de Beauharnais, Viceroy of Italy, and was an encrypted troop briefing passed to Marmont on Napoleon's orders.
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AI decodes 217-year-old Napoleonic letter in 6 hours
An engineer used artificial intelligence to decode a military cypher from the Napoleonic era that had gone unsolved for more than two centuries.