Deciphering Beauregard’s Post-Shiloh Dispatch
O n April 11, 1862, Federal forces under the command of Brigadier General Ormsby M. Mitchel captured Huntsville, Alabama in a surprise move upon the vital Memphis & Charleston Railroad. Troopers from the 4 th Ohio Cavalry galloped into town at dawn, quickly seizing the post office and railroad depot. Among the papers of the telegraph office, they discovered a dispatch from General P.G.T. Beauregard dated from two days before at Corinth, Mississippi. Upon receiving this dispatch, General Mitchel’s staff set to work deciphering the document. “It is a simple and easy cipher which required General Mitchel and his aides about 20 minutes to translate,” a reporter from the Cincinnati Gazette noted. But how did they actually crack the code? And why was this seemingly important document sitting on a desk in Huntsville? This article explores those questions.