A canoe, a spar and thirty pounds of powder
Under Beauregard’s instructions an officer tried a boat torpedo in Charleston Harbor: a twenty-foot canoe carrying a spar that projected twenty-two feet beyond her bow, with nearly thirty pounds of powder at the end, against an abandoned gunboat ballasted with rubbish from the burnt district. A northwest gale and the ebb tide spoiled the moorings, and he made the trial anyway. Charleston was inventing the torpedo boat by experiment.
Official Records, Series I, Vol. 14