Statistics for occurrence #1 of “Roanoke River” in chapter 41 of Admiral David D. Porter, The Naval History of the Civil War.:

...tunity offered. At 1 o'clock P. M. on the 5th of May, the Miami, Commodore Hull, Ceres and army transport Trumpeter got underway from the picket station off Edenton Bay, bound to the mouth of the Roanoke River , for the purpose of laying down torpedoes. Within a short distance of the buoy, at the mouth of the river, the Albemarle was discovered coming down, accompanied by the steamers Cotton plant and Bo...
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