Son of Henry Edward O'Neill, Pinehurst, Heathfield. b. 1815.
Bedfordshire Regt. (from Militia) 1896; Captain 1902; retired 1908; East Africa 1901—02, Despatches (2), Medal with Clasp; entered service of Colonial Office 1908; Assistant District Commissioner Uganda, 1910.
Great War, re-joined Bedfordshire Regt; Major Middlesex Reg.
Husband of Margaret Theodora O'Neill.
Citation to Military Cross: 'For conspicuous gallantry and devotion to duty in making a most daring personal reconnaissance of the enemy's wire. Accompanied by an N.CO, and two runners, he crawled through a gap in the wire and got in rear of the enemy's post. Finding it occupied by two of the enemy, he shot them in the legs with his revolver and took them both prisoners. He set a fine example of initiative and gallantry to his battalion'.