Statistics for occurrence #1 of “Arkansas river” in chapter 9 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

... This, however, was not Shelby's army, but Harrell's detachment. On the 27th, McNeil, with his brigade, marched into Clarksville on the Arkansas, to learn that Shelby had made the crossing of the Arkansas river below there, and that Brooks had gone. He turned his course up the river toward Van Buren and Fort Smith. His force consisted of Hunt's First Arkansas cavalry, and Iowa, Missouri and Wisconsin tr...
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