Statistics for occurrence #1 of “St. Charles” in chapter 5.74 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 3.:

...t all. The side armor had no heavy backing, and such as it was could only ward off a shot directly abeam. It was by no means a complete protection to the boilers, as was shown in the catastrophe at St. Charles . The Arkansas on the other hand had three inches of railroad iron surrounding her casemate, with a heavy backing of timber and cotton bales. She had, besides, her ram, which experience had shown ...
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