Statistics for occurrence #1 of “Fort Clinch” in chapter 8 of Admiral David D. Porter, The Naval History of the Civil War.:

... and were so covered by the growth of the country and so isolated from each other that striking them from the sea would have been almost a matter of chance. These earthworks and the heavy guns of Fort Clinch commanded the main ship channel so as to rake an approaching foe. Besides these was a battery of four guns on the south end of Cumberland Island, the fire of which crossed the channel inside the bar....
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