| Regimental number | 1056 |
| Religion | Church of England |
| Occupation | Survey chainman |
| Address | Nyah, Victoria |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, Thomas Byrnes, Nyah, Victoria |
| Enlistment date | 2 March 1915 |
| Rank on enlistment | Private |
| Unit name | 23rd Battalion, B Company |
| AWM Embarkation Roll number | 23/40/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A14 Euripides on 10 May 1915 |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 2nd Machine Gun Battalion |
| Fate | Returned to Australia 16 June 1919 |
| Miscellaneous details (Nominal Roll) | *Garret spelt Garrett |
| Family/military connections | Brother: 56 Driver Percy Thomas BYRNES, 3rd Pioneer Bn, returned to Australia, 27 September 1917. |