Where to put a 10-inch Parrott
The ordnance department delivered a 10-inch Parrott rifle for the siege and its position came up for argument. Brooks pressed for a spot 225 yards in advance of the first parallel: five hundred and fifty yards nearer Fort Sumter, and better isolated from the James Island fire. The whole campaign turned on yards of range.
Major Brooks’ journal, OR I, 28, Pt. 1