Statistics for occurrence #1 of “Fort Walker” in chapter 3, page 19 of Daniel Ammen, Confederate Military History, a library of Confederate States Military History: Volume 7.2, The Atlantic Coast:

...l to the Seneca, the Curlew, and the Isaac Smith to follow, and standing in, opened fire on Tatnall's steamers, and drove them within the headlands, coming themselves within a distant cross-fire from Fort Walker on Hilton Head, and Fort Beauregard on Bay Point. Flag-Officer Dupont says: These vessels made a reconnoissance in force, and drew the fire of the batteries on Hilton Head and Bay Point sufficiently ...
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