Statistics for occurrence #1 of “Hilton Head” in chapter 3 of Daniel Ammen, Confederate Military History, a library of Confederate States Military History: Volume 7.2, The Atlantic Coast:
...t low sandy shores which form the land-locked harbor; only the tops of the taller trees are visible, except in certain states of the atmosphere when the mirage brings up to view continuous forests on Hilton Head to the west, and Bay Point on the east side of the harbor.
Several of the vessels of war, among them the gunboats and the surveying steamer Vixen, were directed to feel their way in with the lead, ...
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