| Regimental number | 1361 |
| Place of birth | Warragul, Victoria |
| School | Warragul State School, Victoria |
| Religion | Methodist |
| Occupation | Carpenter |
| Address | 'Sylvia', Carlisle Crescent, Oakleigh, Victoria |
| Marital status | Single |
| Age at embarkation | 22 |
| Height | 5' 6.5" |
| Weight | 147 lbs |
| Next of kin | Father, John J Brittain, 'Sylvia', Carlisle Crescent, Oakleigh, Victoria |
| Previous military service | Nil |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Melbourne, Victoria |
| Rank on enlistment | Private |
| Unit name | 29th Battalion, 1st Reinforcement |
| AWM Embarkation Roll number | 23/46/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 29th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | Fleurbaix, France (Battle of Fromelles) |
| Age at death | 23 |
| Age at death from cemetery records | 23 |
| Place of burial | Rue-Petillon Military Cemetery (Plot I, Row K, Grave No. 75), France |
| Panel number, Roll of Honour, Australian War Memorial | 115 |
| Miscellaneous information from cemetery records | Parents: John Iliffe and Emma BRITTAIN, 'Latrobe', Sutherland Street, Murrumbeena, Victoria. Born at Warragul, Victoria |
| Other details |
War service: Egypt, Western Front Embarked Melbourne, 10 November 1915; disembarked Suez, 7 December 1915. Taken on strength of 29th Bn, Serapeum, 13 December 1915. Embarked Alexandria to join the British Expeditionary Force, 16 June 1916; disembarked Marseilles, France, 23 June 1916. Killed in action, 20 July 1916. Buried Eaton Hall Cemetery by Reverend George Cranston, 20 July 1916. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Name recorded incorrectly on embarkation roll as BRITTIAN. |
| Sources | NAA: B2455, BRITTAIN William |