1st Battalion, Royal Dublin Fusiliers
Henry was the youngest son of five to the Rev. H. M. M. Hackett. His father was originally from Dublin; however moved about on many occasions.
At the time of Henry's death he was Vicar of St. Peter's, Belsize Park, London. Henry's home address was given on enlistment as 'The Deanery, County Waterford'.
Before joining Campbell College in 1911, Henry was a pupil at Templegrove School, Eastborne, and West Sussex. By October 1914, Henry was attending Sandhurst. He joined the Royal Dublin Fusiliers on St Patrick's Day of 1915, serving with the 1st Battalion of the Royal Dublin Fusiliers, at Sulva Bay, Gallipoli. They were still at Sulva Bay at the start of November 1915 and the War diary reports work was being done on a new fire trench: "Traverse put in new trench. Very little sniping, either hostile or by us. Enemy stalled us for a short time. Regret to report chance shrapnel bullet killed 2nd Lieutenant HRT Hackett while he was at tea". He is buried at Azmak Cemetery, Sulva Turkey.
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