| Regimental number | 1403 |
| Place of birth | Sydney New South Wales |
| Religion | Presbyterian |
| Occupation | Clerk |
| Address | 5 Temple Street, Stanmore, New South Wales |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Father, T Blackadder, 5 Temple Street, Stanmore, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 33rd Battalion, Headquarters |
| AWM Embarkation Roll number | 23/50/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A74 Marathon on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 33rd Battalion |
| Fate | Effective abroad (still overseas) |
| Medals |
Military Medal Source: 'Commonwealth Gazette' No. 95 Date: |
| Family/military connections | Brother: 1402 Sergeant Clarence Douglas BLACKADDER, 33rd Bn, returned to Australia, 8 September 1919. |