| Regimental number | 3018 |
| Place of birth | Ballarat, Victoria |
| Religion | Roman Catholic |
| Occupation | Railway officer |
| Address | Howard Street, Fremantle, Western Australia |
| Marital status | Single |
| Age at embarkation | 36 |
| Next of kin | Mother, Mrs Kate Brennan, Howard Street, Fremantle, Western Australia |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Provisional CPL |
| Unit name | 28th Battalion, 7th Reinforcement |
| AWM Embarkation Roll number | 23/45/2 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A7 Medic on |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 3rd Australian Light Railway Operating Company |
| Fate | Returned to Australia |
| Family/military connections | Brother: 489 Pte Henry BRENNAN, 4th Motor Transport Company, effective abroad (still overseas). |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |