| Regimental number | 3526 |
| Place of birth | Mannum, South Australia |
| Religion | Methodist |
| Occupation | Farmer |
| Address | Blanchetown, South Australia |
| Marital status | Single |
| Age at embarkation | 22.4 |
| Next of kin | Father, Walter William Castle, Blanchetown, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 32nd Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/49/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 32nd Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 24 |
| Place of burial | Serre Road Cemetery No. 2 (Plot XXVII, Row C, Grave No. 15), France |
| Panel number, Roll of Honour, Australian War Memorial | 120 |
| Miscellaneous information from cemetery records | Parents: Walter and Angelina CASTLE, Blanchetown, South Australia |
| Family/military connections | Brother: 3525 Pte George William CASTLE, 32nd Bn, returned to Australia, 20 November 1918. |
| Other details |
War service: Western Front Embarked Adelaide, 12 August 1916; disembarked Devonport, England, 30 September 1916. Proceeded overseas to France, 16 January 1917. On leave to United Kingdom, 28 January 1918. Admitted to 1st Australian Dermatological Hospital, Bulford, 6 February 1918; discharged to duty, 23 March 1918; total period of treatment for venereal disease: 46 days. Rejoined unit, in the field, 12 June 1918. Killed in action, 20 June 1918. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, CASTLE Leslie Gordon |