This Cipher That Napoleon Used Went Unsolved For 217 Years. ChatGPT Just Solved It In Six Hours

Image caption: Napoleon sent the cipher to General Auguste de Marmont in March 1809 in hopes of warning him about enemy troop positions on the eve of war with Austria. Image credit: Horace Vernet via Wikimedia Commons. Public Domain. Article by Ella Spitz. All That’s Interesting – October 2, 2026.

In March 1809, on the precipice of war with the Austrian Empire, French leader Napoleon Bonaparte sent a message to his senior general, Auguste de Marmont. The first line was in standard French: “You must have received, General Marmont, my letters of the 8th, 14th and 20th of this month.” But the next 24 lines were all written in code. […]

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