Statistics for occurrence #1 of “Arkansas River” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:

...r-Admiral Porter, had been actively engaged in the work of suppressing the Rebellion, and co-operated zealously with the Army whenever its services were needed. The capture of Arkansas Post, on the Arkansas River , and the constant effective attacks on the batteries of Vicksburg, the bombardment of the city and its defences, the battle of Grand Gulf and the landing of Grant's army at Bruensburg, and the final ...
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