Statistics for occurrence #1 of “Mississippi River” in chapter 12 of Varina Davis, Jefferson Davis: Ex-President of the Confederate States of America, A Memoir by his Wife, Volume 1:

...and overtook the Indians while crossing the Wisconsin and attacked their rear-guard, which, when the main body had crossed, swam the river and joined in the retreat over the Kickapoo hills toward the Mississippi River . General Atkinson with his whole army continued the pursuit, and after a toilsome march overtook the Indians north of Prairie du Chien, on the bank of the Mississippi River, to the west side of which...
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