Statistics for occurrence #1 of “Fort Walker” in chapter 34 of Admiral David D. Porter, The Naval History of the Civil War.:

... mark for the enemy's fire. On reaching the extremity of Hilton Head and the shoal ground making off from it, the line was to turn to the north by the east, and, passing to the northward, to engage Fort Walker with the port battery nearer than when first on the same course. These evolutions were to be repeated. The accompanying plan will explain the preceding description. The captains of the ships ...
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