Statistics for occurrence #1 of “Arkansas river” in chapter 8 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

...y special orders of General Grant, Maj.-Gen. Frederick Steele was assigned to the command of the army, to take the field from Helena, and on August 11th he assumed command of all of Arkansas north of Arkansas river . His military force included the infantry divisions of Col. W. E. McLean and Gen. S. A. Rice, present for duty, 4,493; cavalry under Gen. J. W. Davidson and Colonel Clayton, present for duty, 4,652...
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