| Regimental number | 319 |
| Place of birth | Campbelltown New South Wales |
| Religion | Roman Catholic |
| Occupation | Groom |
| Address | Box Hill Road, Oakleigh, Victoria |
| Marital status | Married |
| Age at embarkation | 48 |
| Next of kin | Wife, Mrs Catherine Brennan, Box Hill Road, Oakleigh, Victoria |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | Australian Remount Unit 1, Squadron 2 |
| AWM Embarkation Roll number | 28/2/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board TRANSPORT A67 Orsova on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 1st Remount Unit |
| Fate | Returned to Australia |
| Family/military connections | Sons: 64 Pte Frank Patrick BRENNAN, 6th Bn, killed in action, 25 April 1915; 446 Corporal William John BRENNAN, 1st Light Railway Unit, returned to Australia, 1 July 1919; Uncle: 6225 Pte Richard Luke BRENNAN, 5th Bn, killed in action, Passchendaele, Belgium, 4 October 1917. |
| Other details |
War service: Egypt Medals: 1914-15 Star, British War Medal, Victory Medal |