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

... the mortars, gun-boats and naval batteries upon the city and its defences before it capitulated. The creation and organization of this huge squadron, which has done such effective service on the upper Mississippi and its tributaries, extending over a distance of more than 3,500 miles, may justly be considered among the most wonderful events of the times. It is but little over two years since we had not a na...

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