| Regimental number | 1548 |
| Place of birth | Penguin Tasmania |
| Religion | Presbyterian |
| Occupation | Agent |
| Address | Penguin, Tasmania |
| Marital status | Single |
| Age at embarkation | 24 |
| Next of kin | Father, Henry G. Mainwaring, Penguin, Tasmania |
| Enlistment date | 4 August 1915 |
| Rank on enlistment | Private |
| Unit name | 3rd Light Horse Regiment, 11th Reinforcement |
| AWM Embarkation Roll number | 10/8/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board SS Hawkes Bay on 28 October 1915 |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 10th Field Artillery Brigade |
| Fate | Returned to Australia 21 December 1917 |
