| Full Name | O'BRIEN Robert |
| Service Number | 3679 |
| Date Enlisted | 10/July/1915 |
| Age | 22 |
| Occupation | Labourer |
| Battle | Moquet Farm |
| Initial Unit | 22nd Battalion |
| Last Unit | 57th Battalion |
| Final Rank | Private |
| Date of Death | 20-August-1916 |
| Country | France |
| Cause of Death | DoW |
| Place of Burial | Estaires Communal Cemetery and Extension |
| Citations | |
| Notes | WIA 19 Aug 1916 |
| Other Notes | |
| Graveyard Image | 4812 |