Statistics for occurrence #1 of “Capt. Donelson McGregor” in chapter 11, page 292 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

...rtermous, of DeWitt. The regiment was immediately ordered to Richmond, and on the road attracted much attention, being known to have among its captains a grandson of the immortal Davy Crockett, and Capt. Donelson McGregor , who was reared near the Hermitage, and was grand-nephew of the beloved wife of Old Hickory. The regiment was stationed at Aquia creek, near Fredericksburg, in the brigade of Gen. T. H. Holmes, and...
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