Statistics for occurrence #1 of “lower Mississippi” in chapter 5, page 36 of John Dimitry , A. M., Confederate Military History, a library of Confederate States Military History: Volume 10.1, Louisiana:

...hot-proof with cotton bulkheads, and provided with iron prows to act as rams; but vain was the hope that with such auxiliaries the exploits of the Merrimac in Hampton Roads could be duplicated in the lower Mississippi . In
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