Statistics for occurrence #1 of “Fort Sumter” in chapter 1.8 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...ter in ruins and destitute of guns. A powerful armament was mounted on the north end of the island, to cooperate with the monitors when they should move in, and to prevent the remounting of guns on Fort Sumter . Early on the morning following the capture of Battery Wagner, the admiral, under a flag of truce, demanded the surrender of Fort Sumter. It was refused. On the night of the 8th a naval assault...
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