Statistics for occurrence #1 of “Arkansas river” in chapter 6 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

...ember 16 to 21, 1862. Hovey failed to reach his destination, and was called back to help Grant in his first campaign against Vicksburg. The Post of Arkansas is situated upon a bluff bank of the Arkansas river , twenty miles from Napoleon on the Mississippi, above the navigable cut-off from White river in Arkansas. The bluff is the southern extremity of the peculiar land feature known as Grand prairie, ly...
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