The notice is sent to Charleston
Lincoln dispatched a State Department clerk, Robert S. Chew, to Charleston with a message to be read to Governor Pickens: an attempt would be made to supply Fort Sumter with provisions only, and if it were not resisted, no men, arms or ammunition would be landed. It was a notification, not a request — and it put the choice of firing first squarely on Charleston.
Official Records, Series I, Vol. 1