A coded message sent to the beleaguered Confederate commander of Vicksburg has been cracked, the BBC reports.

The Museum of the Confederacy in Richmond has had the message in its collection for more than a century. It had never tried to decipher the code of seemingly random letters until this year, when they sent it off to retired CIA codebreaker David Gaddy. While Gaddy is trained to break sophisticated modern codes, this early cipher was still tough enough to take him several weeks.

It turns out the message was sent to Confederate General John Pemberton telling him he wouldn't be getting any reinforcements. The city was the key to the Mississippi River and had been under siege by Union forces for months. The message was dated 4 July 1863, the same day Pemberton surrendered. The bad news was probably the last straw. With his men short of food and munitions and the city in ruins, Pemberton's last hope was getting reinforcements.

The fall of Vicksburg opened up the Mississippi River to Union gunboats and cut the Confederacy in half. It was one of the turning points of the Civil War.


[Photo courtesy U.S. Army]

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