| Regimental number | 1912 |
| Place of birth | Dunfries, Scotland |
| Age on arrival in Australia | 17 |
| Religion | Roman Catholic |
| Occupation | Farmhand |
| Address | Carlton, Victoria |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, John Firth, Victoria Barracks, Melbourne, Victoria |
| Previous military service | Nil |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 46th Battalion, 3rd Reinforcement |
| AWM Embarkation Roll number | 23/63/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A7 Medic on |
| Regimental number from Nominal Roll | 1912A |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 46th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | Unknown |
| Age at death | 19 |
| Place of burial | Bancourt British Cemetery (Plot VII, Row B, Grave No. 19), France |
| Panel number, Roll of Honour, Australian War Memorial | 141 |
| Miscellaneous information from cemetery records | Parents: Jonathan and Emily FIRTH, Victoria Barracks, Melbourne. Native of Dunfries, Scotland |
| Family/military connections | Brother: 1911 Pte Alfred Vincent FIRTH, 46th Bn, returned to Australia, 4 May 1917. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |