| Regimental number | 6960 |
| Place of birth | Sydney New South Wales |
| Religion | Roman Catholic |
| Occupation | Station overseer |
| Address | Floridel, Edgecliffe Road, Woollahra, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, Mr W F Brennan, Edgecliffe Road, Woollahra, New South Wales |
| Enlistment date | 16 August 1916 |
| Date of enlistment from Nominal Roll | 28 July 1916 |
| Rank on enlistment | Private |
| Unit name | 4th Battalion, 23rd Reinforcement |
| AWM Embarkation Roll number | 23/21/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A29 Suevic on 11 November 1916 |
| Rank from Nominal Roll | Lieutenant |
| Unit from Nominal Roll | 4th Battalion |
| Other details from Roll of Honour Circular | Wounded in France. |
| Fate | Returned to Australia 20 June 1919 |
| Family/military connections | Sister Kathleen Adele BRENNAN, Voluntary Aid Detachment, died Leicester, England; Lieutenant William Keating BRENNAN, 12th Light Horse, killed in action, Gaza, Palestine, 20 April 1917. |
