Six hundred and twenty-five shots in a day
At seven in the morning the Federals opened again from Gregg, Wagner and the low battery east of Gregg, concentrating on Fort Sumter with occasional help from the monitors. By dark 625 shots had been fired at the fort and only 90 had missed. Then they stopped briefly and started again with two guns and a mortar for the night.
Journal of Operations in Charleston Harbor, OR I, 28, Pt. 1