Statistics for occurrence #1 of “Bull's Gap” in chapter 8.63 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:
...rom this period until the date of his death, September 4th, 1864, General Morgan was engaged in no military operation of consequence.
He was killed at Greenville while advancing to attack Gillem at Bull's Gap in Tennessee, with the intention, if successful, of marching into middle Tennessee.
He was succeeded in the command of the department by General John C. Breckinridge.
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