| Regimental number | 2152 |
| Place of birth | Wollar New South Wales |
| School | Wollar Public School, New South Wales |
| Religion | Church of England |
| Occupation | Drover |
| Address | Merrylands, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 30 |
| Next of kin | Father, James Brennan, Merrylands, Sydney, New South Wales |
| Previous military service | Nil |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 5th Light Horse Regiment, 15th Reinforcement |
| AWM Embarkation Roll number | 10/10/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A67 Orsova on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 2nd Machine Gun Squadron |
| Fate | Died of disease |
| Age at death | 33 |
| Place of burial | Ismailia War Memorial Cemetery (Row B, Grave no. 50), Egypt |
| Panel number, Roll of Honour, Australian War Memorial | 180 |
| Miscellaneous information from cemetery records | Parents: James and Sarah BRENNAN, Cooks Avewnue, Canterbury, New South Wales. Born at Bylong, New South Wales |
| Family/military connections | Brother: 6204 Pre Gratton BRENNAN, 18th Bn, killed in action, Bullecourt, France, 3 May 1917. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |