| Regimental number | 3966 |
| Place of birth | Gin Gin Queensland |
| Religion | Methodist |
| Occupation | Labourer |
| Address | Walla road, Gin Gin, Bundaberg, Queensland |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, Lars Neilsen, Walla Road, Gin Gin, Bundaberg, Queensland |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 25th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/42/3 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT Wandilla on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 4th Pioneer Battalion |
| Fate | Returned to Australia |
| Family/military connections | Brother: 3967 Pte Hans Julius NEILSEN, 49th Bn, returned to Australia, 5 April 1919. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |