Statistics for occurrence #1 of “Mississippi river” in chapter 15 of Admiral David D. Porter, The Naval History of the Civil War.:

...ed on the 14th of February, the day before the Confederate works on the Cumberland were carried, while Columbus and the other end of the strategic line were evacuated early in March, thus leaving the Mississippi river free from the Confederate flag from St. Louis to Arkansas. The news of this victory was very encouraging to the Union people, especially when they beheld its results. When city after city fell ...
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