AI Decodes Napoleon-Era Military Message After 217 Years

An encrypted military message from the time of Napoleon has been deciphered using artificial intelligence, ending roughly 217 years in which its contents remained locked behind coded symbols.

The breakthrough took just six hours. Working from a single image of the document, AI helped recover the message without the need for a lengthy manual decoding effort.

The letter revealed what Napoleon told his military commanders ahead of a war with Austria. Its decipherment offers a glimpse into imperial military communications at a moment of approaching conflict.

The account does not specify the instructions contained in the message or explain the technical steps used to decode it. Even so, the contrast is striking: a text that resisted reading for more than two centuries became accessible in a matter of hours.