| Regimental number | 21 |
| Place of birth | Dublin, Ireland |
| Other Names | Michael |
| Religion | Roman Catholic |
| Occupation | Engineer |
| Address | Nil |
| Marital status | Single |
| Age at embarkation | 27 |
| Next of kin | Brother, Patrick McGuinness Manager Glasgow Shipping Office, North Wall, Dublin, Ireland |
| Enlistment date | 23 August 1914 |
| Place of enlistment | Brisbane, Queensland |
| Rank on enlistment | Driver |
| Unit name | 9th Battalion, Headquarters |
| AWM Embarkation Roll number | 23/26/1 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board Transport A5 Omrah on 24 September 1914 |
| Rank from Nominal Roll | Private |
| Fate | Returned to Australia 31 October 1917 |
| Miscellaneous details (Nominal Roll) | 9th Bn |
| Sources | NAA: B2455, McGUINNESS M |