Statistics for occurrence #1 of “Confederate States” in chapter 3 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

...lonel, and J. T. Harris, major. L. H. Mangum was made adjutant of the regiment. It was the First regiment of infantry, State troops, but subsequently, upon the transfer of the State troops to the Confederate States service, according to the date of such transfer, it was numbered the Fifteenth Arkansas infantry, provisional army of the Confederate States, although in the unavoidable confusion consequent upon a c...
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