| Regimental number | 3841 |
| Place of birth | Glen Innes, New South Wales |
| School | Provisional School, New South Wales |
| Religion | Church of England |
| Occupation | Labourer |
| Address | Orabah, Mungallala, Queensland |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 8.5" |
| Weight | 148 lbs |
| Next of kin | Father, Abram Irwin, Orabah, Mungallala, Queensland |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Morven, Queensland |
| Rank on enlistment | Private |
| Unit name | 25th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/42/3 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT Wandilla on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 25th Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 24.2 |
| Place of burial | Warlencourt British Cemetery (Plot VI, Row C, Grave No. II), France |
| Panel number, Roll of Honour, Australian War Memorial | 105 |
| Miscellaneous information from cemetery records | Parents: Abram and Keziah IRWIN, Orabah, Mungallala, Queensland |
| Family/military connections | Brother: 4321 Pte John David IRWIN, 15th Bn, returned to Australia, 2 January 1919; died of illness, 2 January 1919. |
| Other details |
War service: Egypt, Western Front Admitted to 4th Auxiliary Hospital, Abbassia, 1 April 1916 (mumps); discharged to duty, 13 April 1916. Embarked Alexandria to join the British Expeditionary Force, 25 July 1916; disembarked Marseilles, France (date not recorded). Taken on strength, 25th Bn, in the field, 8 August 1916. Killed in action, 5 November 1916. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, IRWIN Thomas Henry |