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.:

...developed in the conflict before Charleston; and formerly in the Battle of the earth-works on the Crimea. The defensive strength of Battery Wagner throughout the siege, and the alleged strength of Fort Sumter after it had been battered into a shapeless mass of ruins, are mistakenly cited as evidence that earth-works are better than forts of brick or stone, and are quite sufficient to meet any expected nav...
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