Statistics for occurrence #1 of “Mississippi river” in chapter 12 of Elias Nason, McClellan's Own Story: the war for the union, the soldiers who fought it, the civilians who directed it, and his relations to them.:

...robably give you another, which will bring your force to nearly 18,000. The object of your expedition is one of vital importance — the capture of New Orleans. The route selected is up the Mississippi river , and the first obstacle to be encountered (perhaps the only one) is in the resistance offered by Forts St. Philip and Jackson. It is expected that the navy can reduce these works; in that case you ...
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