Also see Coggins Point and Fort Sherman
"...Port Royal. From then on all official reports referred to Port Royal, rather than Hilton Head, and many people thought they were two different places, especially since Port Royal was already the name of the island on which Beaufort was located. Port Royal
Holmgren, Virginia C., Hilton Head, A Sea Island Chronicle, p. 96
"Almost in its entirety, Squire William Pope's Coggins Point Plantation became "the town", Port Royal, South Carolina, with civilian Joseph H. Sears, publisher and owner of the weekly newspaper, The New South, as postmaster."
Peeples, Robert, Islander Magazine, April 1976, p. 25
"It was a Union enclave established by the Federal invaders in the War Between the States, and its population (including runaway slaves) mushroomed to 50,000 and more, making it during its short existence a metropolis of the South.
For a city created to serve as a supply base for Union ships blockading Southern ports, a better site than Hilton Head Island would have been hard to find. The Yankees hurriedly established their Department of the South on the island, which bordered on one of the world's best natural harbors - Port Royal Sound."
Smith, Loran, South Carolina Illustrated, November 1970, "Makeshift Metropolis"