| Regimental number | 427 |
| Place of birth | Guyra New South Wales |
| Religion | Church of England |
| Occupation | Grazier |
| Address | Boori, Curlewis, New South Wales |
| Marital status | Single |
| Age at embarkation | 25 |
| Next of kin | Father, W Grattan, Boori, Curlewis, New South Wales |
| Enlistment date | 25 January 1916 |
| Rank on enlistment | Lance Corporal |
| Unit name | 33rd Battalion, B Company |
| AWM Embarkation Roll number | 23/50/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A74 Marathon on 4 May 1916 |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 33rd Battalion |
| Fate | Returned to Australia 26 September 1917 |
| Miscellaneous details (Nominal Roll) | *Spelt John Sidney Grattan on NR |
