| Service number | 443 |
|---|---|
| Rank | Private |
| Unit | 2nd Australian Light Horse Regiment |
| Conflict/Operation | First World War, 1914-1918 |
| Enlistment Date | 1914-09-26 |
| Fate | Killed in action |
| Fate Date | 12 July 1915 |
First World War Nominal Roll William Harold O'Brien
| Service number | 443 |
|---|---|
| Rank | Private |
| Unit | 2nd Australian Light Horse Regiment |
| Conflict/Operation | First World War, 1914-1918 |
| Enlistment Date | 1914-09-26 |
| Fate | Killed in action |
| Fate Date | 12 July 1915 |
