Fifteen mortar shells, twelve of them hits
“Nothing unusual this morning.” Captain Mitchel’s noon report from Fort Sumter: a small working party hauling sods to the middle battery, fifteen mortar shells fired at the fort during the night, of which twelve struck. That was an ordinary night in the fort in 1864, and the reports read the same for months at a time.
Official Records, Series I, Vol. 35, Pt. 1