| Regimental number | 2593 |
| Place of birth | Monaghan, Ireland |
| Religion | Presbyterian |
| Occupation | Tram conductor |
| Address | 354 Victoria Street, Darlinghurst, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | Mother, Mrs M Flack, Lasnagora Lodge, Awinestown, Fermanagh, Ireland |
| Enlistment date | |
| Place of enlistment | Liverpool, New South Wales |
| Rank on enlistment | Private |
| Unit name | 4th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/21/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A54 Runic on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 4th Battalion |
| Recommendations (Medals and Awards) |
Military Medal (awarded) 'Valuable services and gallantry at Pozieres.' Recommendation date: |
| Fate | Returned to Australia |
| Medals |
Military Medal 'At POZIERES, FRANCE, 15th. to 19th. August 1916 Private FLACK, who was attached to the A.P.M. for traffic control guided Officers and parties about the position in which most of the trenches had been blown in. He collected numbers of men who had lost their way and returned them to the front line with bombs and water. He acted as runner and as stretcher bearer and brought three wounded men to the Dressing Station successively on his back. He rendered very valuable service in sending forward stragglers.'
Source: 'Commonwealth Gazette' No. 62 Date: |
| Other details | Medals: Military Medal, 1914-15 Star, British War Medal, Victory Medal |
| Date of death | |
| Place of burial | Northern Suburbs Crematorium |
| Sources | NAA: B2455, FLACK William Robert |