Statistics for occurrence #1 of “Mississippi river” in chapter 1.12 of Southern Historical Society Papers, Volume 21.:

... glancing over the records of those days; let us look back to May 1, 1862. The Confederacy was appalled to hear that the great fleet under Farragut and the large army under Butler had entered the Mississippi river at the mouth; had reduced Forts Jackson and St. Philip, and had arrived at New Orleans, and taken possession of the defenseless city. The Mississippi, which split the Confederacy in twain, was open...
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