| Regimental number | 446 |
| Place of birth | Ballarat, Victoria |
| Religion | Roman Catholic |
| Occupation | Fireman |
| Address | Kensington, Victoria |
| Marital status | Married |
| Age at embarkation | 24 |
| Next of kin | Wife, Mrs Olive Brennan, 63 Hardiman Street, Kensington, Victoria |
| Enlistment date | |
| Rank on enlistment | 2nd Corporal |
| Unit name | Railway Unit, Section 2 |
| AWM Embarkation Roll number | 15/9/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 1st Australian Light Railway Operating Company |
| Fate | Returned to Australia |
| Family/military connections | Father: 319 Patrick Brennan, 1st Australian Remount Unit, returned to Australia; Brother: 64 Francis Patrick BRENNAN, 6th Bn, killed in action, Gallipoli, 25 April 1915; Uncle: 6225 Richard Luke BRENNAN, 5th Bn, killed in action, Passchendaele, Belgium, 4 October 1917. |