Statistics for occurrence #1 of “Mc-Elroy” in chapter 3, page 28 of Colonel Charles E. Hooker, Confederate Military History, a library of Confederate States Military History: Volume 12.2, Mississippi:

...pon the Confederate flank, which he might easily have done, and given the battle an entirely different conclusion. On the following morning, Colonel Barksdale sent Captain Eckford, with his own and Mc-Elroy 's companies, against the enemy at Edwards Ferry, and presently the whole regiment joined in the action,
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