For a list of engagements through September 1864, see letter, Sellers to Bennett, 24 September 1864. He supplied another list on 10 November 1864. The two lists are not identical.
Battles marked '*' are listed in the Official Army Register as ones in which the 91st bore 'an honorable part, and which they are entitled to bear on their colors'.
- *Antietam (Maryland) (16-17 September 1862--but the 91st arrived on 18 September)
- Leetown Virginia (16-17 October 1862)
- *Fredericksburg (12-15 December 1862)
- *Chancellorsville (1-5 May 1863)
- *Gettysburg (1-3 July 1863)
- Wapping Heights, Virginia (23 July 1863)
- Brandy Station, Virginia (11 October 1863)
- *Rappahannock Station (7 November 1863)
- *Mine Run (26 November-2 December 1863)
- *Wilderness (5-7 May 1864)
- Laurel Hill (8 May 1864)
- *Spottsylvania (8-21 May 1864)
- *North Anna (23-26 May 1864)
- Pamunkey
- *Tolopotomoy (28-31 May 1864) [Old Church, 29-30 May]
- *Bethesda Church (1-3 June 1864)
- Cold Harbor (1-12 June 1864)
- *Petersburg (16-18 June 1864) [Norfolk Railroad, 18 June]
- *Weldon Railroad (18-21 August 1864)
- *Peeble's Farm (30 September 1864)
- *Hatcher's Run (27-28 October 1864)
- Raid on Weldon Railroad (7-12 December 1864)
- Dabney's Mill (5-7 February 1865)
- Five Forks (1 April 1865)
- Appomattox Court House (9 April 1865)