He served as captain in the King's County Militia. and was appointed High Sheriff of King's County in 1811 and again in 1836 and served as Deputy Lieutenant of that county. He became Receiver General of Stamps in Ireland in 1831, an office he held until its abolition in 1841, when he was created a baronet, of Gallen Priory, in King's County as compensation.
In February of the same year, he entered the British House of Commons in a by-election, sitting for King's County until 1852. While in Parliament he argued against the laws restricting commerce in Ireland ...'I never can be satisfied that my country should be bound in calfskin'..., for the establishment of ship manufacturing in Ireland, and for provisions to be made for the Catholic Clergy.
His youngest son, Charles Nesbitt Frederick Armstrong (1858–1948), born when his father was 71 or 72, went to Queensland, Australia, and married Helen Porter Mitchell (the opera singer, Dame Nellie Melba) in 1882. They had a son, George, but separated after a year and later divorced.
- "Leigh Rayment - Baronetage". Retrieved 30 July 2009.
- Dod, Robert P. (1860). The Peerage, Baronetage and Knightage of Great Britain and Ireland. London: Whitaker and Co. p. 93.
- "ThePeerage - Sir Andrew Armstrong, 1st Bt". Retrieved 30 July 2009.
- Sylvanus, Urban (1863). The Gentleman's Magazine. part I. London: John Henry and James Parker. pp. 392–393.
- The London Gazette: . 24 August 1841. Retrieved 17 October 2009.
- "Leigh Rayment - British House of Commons, King'S County". Retrieved 30 July 2009.
- "Hansards - Protection of Life (Ireland) Bill". Retrieved 21 November 2009.
- Hansard 1803–2005: contributions in Parliament by Andrew Armstrong
|Parliament of the United Kingdom|
John Craven Westenra
|Member of Parliament for King's County
1841 – 1852
With: John Craven Westenra
Sir Patrick O'Brien, 2nd Bt
Loftus Henry Bland
|Baronetage of the United Kingdom|
(of Gallen Priory)
Edmund Frederick Armstrong
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