| Regimental number | 5030 |
| Place of birth | Brisbane, Queensland |
| School | Christian Brothers (Catholic) College, Mudgee, New South Wales |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | Toowong, Queensland |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, William Charles Horstmann, Norwood Street, Toowong, Queensland |
| Previous military service | Served in the Cadets. |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 31st Battalion, 14th Reinforcement |
| AWM Embarkation Roll number | 23/48/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A20 Hororata on |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 3rd Field Artillery Brigade |
| Other details from Roll of Honour Circular | 'Awarded the Royal Human Society Certificate for life saving at Southport, Queensland.' |
| Fate | Killed in Action |
| Place of death or wounding | Peronne, France |
| Age at death | 21 |
| Age at death from cemetery records | 21 |
| Place of burial | Hebecourt British Cemetery (Row A, Grave No. 12), France |
| Panel number, Roll of Honour, Australian War Memorial | 12 |
| Miscellaneous information from cemetery records | Parents: William and Elizabeth HORSTMANN, 'Bellevue', Toowong, Brisbane, Queensland |
| Family/military connections | Brother: 1139 Pte Vincent Herbert HORSTMANN |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
