| Regimental number | 8750 |
| Place of birth | Gunning New South Wales |
| Religion | Roman Catholic |
| Occupation | Boot operator |
| Address | Montague Street, Goulburn, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, P Byrnes, Montague Street, Goulburn, New South Wales |
| Enlistment date | 9 August 1915 |
| Rank on enlistment | Driver |
| Unit name | 2nd Divisional Ammunition Column |
| AWM Embarkation Roll number | 25/90/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A39 Port Macquarie on 16 November 1915 |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 4th Field Artillery Brigade |
| Fate | Returned to Australia 14 January 1919 |
| Family/military connections | Brother: 8749 Driver Cecil John BYRNES, ......... |