Statistics for occurrence #1 of “Cape Fear River” in chapter 52 of Admiral David D. Porter, The Naval History of the Civil War.:

...ndred and thirty miles from land was the third line, on which the vessels were about eight miles apart, the half-circle ending at Beaufort, N. C., on one side, and closing in on the south entrance to Cape Fear River . If a blockade-runner came out of Wilmington before daylight, she would be seen by vessels on the middle circle; and, if she escaped those, she would be chased by the vessels on the outer circle. ...
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