Statistics for occurrence #1 of “Confederate States” in chapter 15.60 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...hey met the secretary and myself on the 23d of June, 1861. Mr. Porter brought and submitted to the secretary a model described by the latter in a report dated March 29th, 1862, to the congress of the Confederate States , as a fiat-bottomed light-draught propeller, casemated battery, with inclined iron sides and ends. The hull of this model did not extend beyond the shield. The secretary then called the attentio...
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