Statistics for occurrence #1 of “U. S. A.” in chapter 17 of Admiral David D. Porter, The Naval History of the Civil War.:

... Cairo.) Since the battle with the Confederate rams a new organization had been added to the Union fleet in the shape of a ram flotilla,commanded by a very gallant man, Col. Charles Ellet, of the U. S. A. my. These vessels were simply ordinary river steamers converted into rams, though not in a very effective manner. They had been strengthened with timber and had the boilers partially protected fro...
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