Statistics for occurrence #1 of “Arkansas River” in chapter 14 of Wiley Britton, Memoirs of the Rebellion on the Border 1863.:

...tes him and the foe, the marksmanship of the party firing, the gun and its range. Our carbines, by raising the sights to the outside limit, will carry a ball to the mark about a thousand yards. The Arkansas River is not quite that wide at any point within ten miles of here. The enemy, therefore, after they get the approximate range of our carbines, will not likely very often venture inside of this range. ...
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