Statistics for occurrence #1 of “Col. Evander McNair” in chapter 4, page 82 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:
... tax. Some of the cavalry were dispatched to protect the flanks, or, as Colonel Greer expressed it, to keep the cavalry out of the way of the infantry bringing up the rear of the retreating army.
Col. Evander McNair , who succeeded to the command of Hebert's brigade, said in his report that at about 10:30
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