| Regimental number | 2089 |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | St Ronans, Parramatta, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, Mr E O DeMestre, St Ronans Parramatta, New South Wales |
| Enlistment date | 4 April 1915 |
| Date of enlistment from Nominal Roll | 3 April 1915 |
| Rank on enlistment | Private |
| Unit name | 13th Battalion, 5th Reinforcement |
| AWM Embarkation Roll number | 23/30/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A55 Kyarra on 13 April 1915 |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 13th Battalion |
| Fate | Returned to Australia 16 June 1919 |
| Miscellaneous details (Nominal Roll) | *Spelt Pelham De Mestre on NR |