Statistics for occurrence #1 of “Mississippi River” in chapter 24 of Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865:

...eauregard, upon assuming command of his new military district, and, in fact, before he had done so, used every endeavor to introduce a new and entirely different system, in the defensive works of the Mississippi River . He caused them to be almost entirely reconstructed for minimum garrisons, which he knew would be amply adequate, under efficient commanders, to resist a siege of several weeks, or until assistance...
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