| Regimental number | 2539 |
| Place of birth | Lithgow, New South Wales |
| School | Lithgow Public School, New South Wales |
| Religion | Roman Catholic |
| Occupation | Drop forger |
| Address | Brown Street, Lithgow, New South Wales |
| Marital status | Married |
| Age at embarkation | 27 |
| Next of kin | Wife, Mrs Essie Pearl Callaghan, Portland Road, Portland, New South Wales |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 54th Battalion, 5th Reinforcement |
| AWM Embarkation Roll number | 23/71/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A60 Aeneas on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 54th Battalion |
| Fate | Died of wounds |
| Miscellaneous details (Nominal Roll) | *Stated to be Walter Leslie Callaghan on NR |
| Place of death or wounding | Peronne, France |
| Age at death | 31.5 |
| Age at death from cemetery records | 31 |
| Place of burial | St. Sever Cemetery Extension (Block Q, Plot V, Row F, Grave No. 14), Rouen, France |
| Panel number, Roll of Honour, Australian War Memorial | 158 |
| Miscellaneous information from cemetery records | Parents: James and Mary CALLAGHAN; husband of Essie P. CALLAGHAN, Wangee Road, Lakemba, New South Wales. Native of Lithgow, New South Wales |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |