Statistics for occurrence #1 of “Col. Robert T. Preston” in chapter 7 of Col. Robert White, Confederate Military History, a library of Confederate States Military History: Volume 2.2, West Virginia:

...stern Virginia and East Tennessee, commanded by Brig.-Gen. John Echols, with headquarters at Wytheville, Va., comprised the following organizations on February 28, 1865: Echols' infantry brigade, Col. Robert T. Preston 's brigade of reserves, Gen. George B. Cosby's brigade of Kentucky cavalry, Gen. Basil Duke's brigade of Kentucky cavalry, Col. Henry Giltner's brigade of Kentucky cavalry, Gen. John C. Vaughn's briga...
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