| Date of birth | |
| Other Names | SIEKMANN, Thomas Anglesey Brinkworth |
| Religion | Church of England |
| Occupation | Civil servant |
| Address | Poole Street, North Adelaide, South Australia |
| Marital status | Married |
| Age at embarkation | 38 |
| Next of kin | Wife, Mrs J C Siekmann, 'Etruia', Poole Street, North Adelaide, South Australia |
| Enlistment date | |
| Rank on enlistment | Captain |
| Unit name | 11th Light Horse Regiment, C Squadron |
| AWM Embarkation Roll number | 10/16/1 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A7 Medic on |
| Rank from Nominal Roll | Major |
| Unit from Nominal Roll | 9th Light Horse Regiment |
| Promotions |
Major Unit: 9th Light Horse Promotion date: |
| Fate | Returned to Australia |
| Miscellaneous details (Nominal Roll) | Listed on Nominal Roll as Thomas Anglesey BRINKWORTH. |
| Discharge date | |
| Other details |
War service: Egypt, Palestine Commenced return to Australia from Kantara on board HT 'Oxfordshire', 10 July 1919; appointment terminated (discharged), 10 October 1919. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, SIEKMANN Thomas Anglesey |