Statistics for occurrence #1 of “Mr. Fox” in chapter 32 of Admiral David D. Porter, The Naval History of the Civil War.:

...ten feet of water, and therefore able to enter any of the Southern ports). These vessels were of the greatest use during the war, and their value could not be overestimated. On a requisition from Mr. Fox , Mr. Lenthall designed the double-enders, with their heavy batteries of 9 and 11-inch guns and ten feet draft of water, that could follow the 90-day gun-boats through the most narrow and tortuous st...
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