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During the Civil War, it was typical for certain ideas to arise--be it the Battle of the Crater or a diversion channel. Grant used the idea of a channel near Lake Providence, Louisiana, to mitigate problems happening in Vicksburg, Mississippi. I think it was abandoned, and at least the Confederacy still had the town since it wasn't washed out from Union efforts.
Paul B. Martin
Coulterville, CA

Some believe that Napoleon was the model for the "one-horse town" Huck, Jim, the Duke, and the Dauphin visit beginning in Chapter 21 of Adventures of Huckleberry Finn.
Bryan Moore
Jonesboro, AR

The following references have maps showing the location of Napoleon:
Directory of Mark Twain's maxims, quotations, and various opinions: Napoleon, Arkansas, 1863.

Map of the Mississippi River from  Harper's Weekly, January 11, 1862, page 23. 

George Avera
Denton, TX