In February of the same year, he entered the British House of Commons in a by-election, sitting for King's County until 1852.[6] 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.[7]
Marriage and later life
In 1835, Armstrong married Frances, daughter of George Alexander Fullerton, and had by her six sons.[3] He died aged 76 at Chester and was succeeded in the baronetcy by his eldest son Edmund.[4]
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.