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.:

...re of Battery Wagner, which at times not only seriously retarded the labors of the sappers, but threatened the destruction of some of the most advanced of the breaching guns. While the breaching of Fort Sumter was still in progress, active work was resumed on the approaches to Battery Wagner by pushing the full sap from the left of the third parallel. Meanwhile the spring-tides had come with easterly win...
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