| Regimental number | 106 |
| Place of birth | Antrim Ireland |
| Religion | Church of England |
| Occupation | Aviator |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Mother, Mrs Gwynne, The Ferns, Hythe, Kent, England |
| Enlistment date | |
| Rank on enlistment | Lance Corporal |
| Unit name | 7th Battalion, B Company |
| AWM Embarkation Roll number | 23/24/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A20 Hororata on |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | Name does not appear on Nominal Roll |
| Date of death | |
| Age at death from cemetery records | 19 |
| Place of burial | No Known Grave |
| Commemoration details | Helles Memorial, Gallipoli, Turkey |
| Panel number, Roll of Honour, Australian War Memorial | 50 |
| Miscellaneous information from cemetery records | Parents: Maj. James and S. Isabel GWYNNE, The Ferns, Hythe, Kent, England. Native of Manchester, England. True name GWYNNE, Sackville Wyndham Napier, served as GWYNNE, Dennis |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
