Perhaps you are forgetting about the US soldiers who on December 26, 1860, fought the captain of a schooner transporting women and supplies to Fort Johnson in Charleston Harbor, overcame him, and took his ship to Fort Sumter.
Interesting. Especially considering that Ft. Johnson wasn't actually occupied by the South Carolinians until January 2, 1861, according to the OR. Were the women being sent to capture it?
Do you have any other information on this incident? I can't find anything in the OR (or anyplace else) about it.