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.:

...ed by the flying sap, 330 yards in advance of the right of the second parallel. It was deemed inexpedient to push the approaches beyond this point until after the breaching batteries should open on Fort Sumter . From this time forward the fire from the enemy's guns in our front and on our extreme left was severe and. almost uninterrupted. So incessant had it become that many officers and men, especial...
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