Statistics for occurrence #1 of “Arkansas River” in chapter 22 of Wiley Britton, Memoirs of the Rebellion on the Border 1863.:

...invade Missouri. From such information as I can obtain, it looks as if the cavalry divisions of Marmaduke and Shelby were preparing for an immediate invasion of Missouri. The country north of the Arkansas River , above Little Rock, is open to the northern line of the State, and they would meet with little or no opposition until they passed into Missouri. But as soon as they enter that State, they are not l...
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