Lieutenant Arthur Drought O'Carroll was the son of Alfred Arthur O'Carroll (c.1843-1879) and Frances Duffy (1855-1882) and the grandson of the celebrated 19th century Irish Book Publisher, James Duffy (c.1809-1871).
31 July 1905 Lieutenant RAMC. Obtained 445 marks in the examination held in London for commissions in the Royal Army Medical Corps.
Malta 13 Mar 1907 Arrived from Mullingar Co.Westmeath Ireland.
Officer in charge of the 1st Battalion The Connaught Rangers.
On duty at Verdala Barracks Cospicua (Bormla).
Malta 15 Nov 1907 Home leave.
Malta 11 Jan 1908 Returned to Malta. Office in charge 1st/Connaught Rangers at Verdala Barracks.
Malta 26 Feb 1908 Proceeded to Rawalpindi India with the Connaught Rangers, where he served with the Northern Army.
1908–1912 Served in India.
1 Mar 1909 Captain RAMC.
1913 Specialist in Physical Training.
28 July 1914 Start of the Great War.
4 Aug 1914 Britain declares war on Germany.
1914 Served with the British Expeditionary Force in France.
1914–1915 Prisoner of War.
1915 Served in France.
1915–1918 Served in Salonica.
31 July 1917 Major RAMC.
1920–1924 Served in India.
1929–1930 Served in China.
30 July 1930 Retired with the rank of Lieutenant Colonel.
- Entry No: 475. Drew R. 1968. Commissioned Officers in the Medical Services of the British Army 1690–1960. Vol II Roll of Officers in the Royal Army Medical Corps 1898–1960, London: Wellcome Historical Medical Library.
- Succession Books Vol XXII, Returns of statement of service of RAMC Officers.