See the descriptions from 27 April 1863 through 6 May 1863.
- consolidated morning report, 91st PA, 7 May 1863 (apparently the first report after the battle)
- Bates, pp.188-189
- letter listing battles, Sellers to Bennett, 24 September 1864 [lists 1 and 3 May]
- letter listing battles, Sellers to Bennett, 10 November 1864 [3 May only]
- James Cartledge. 'Touching recollections of a brother who gave his life that his country might live'.
- William C Reiff, 'A boy hero: a young drummer made of the right kind of stuff'. National tribune 3 August 1905, page 3, columns 1-2
- 'Further from General Hooker's army', Philadelphia Inquirer, 7 May 1863, page 1
- 'The Ninety-first Pennsylvania at Chancellorville', Philadelphia Inquirer 13 May 1863, page 8
- 'The ninety-first Pennsylvania volunteers', Philadelphia Press, Wednesday 13 May 1863, page 2
- letter, Robert J Armstrong to his family, 24 April 1863 [brief mention of preparation for move]
- statement by William H Jeffries, 9 September 1867, in widow's pension certificate file, National Archives and Records Administration, record group 15, widow's certificate 106,758 (Hannah Clemons widow of Martin Blake)
After the Battle of Chancellorsville, Michael Bergin (E) deserted and joined the Veterans' Reserve Corps.