In April 1830 he became aide-de-camp to Sir John Byng, Commander-in-Chief of the forces in Ireland, at the rank of major, but on 6 July he took half-pay.

Hill's brother, the 3rd Marquess of Downshire, was a minor landowner in Carrickfergus; Lord George had been proposed as a candidate there in the 1826 general election, but had withdrawn in Chichester's favour, stating that he had been unaware of the nomination.

[3] In 1838, Hill bought land in Gweedore (Irish: Gaoth Dobhair), a 'district' in the north-west of County Donegal in the west of Ulster, and, over the next few years, he expanded his holdings to 23,000 acres.

[7] However, his attempts to reform local farming practices, in particular, his suppression of the rundale system of shared landholding, proved unpopular and controversial.

He proposed and she had accepted, but his mother Marchioness of Downshire intervened and forbade the marriage, declaring of her son's poor choice as "No money: all charms!"

[11] They had one son: The Peer, the Priests and the Press: A Story of the Demise of Irish Landlordism by Roy Greenslade (Beyond the Pale Books, 2023) An Tiarna George Hill agus Pobal Ghaoth Dobhair by Cathal Póirtéir (Cló Iar-Chonnacht, 2023) May, Lou and Cass: Jane Austen's Nieces in Ireland by Sophia Hillan (Blackstaff Press, 2011)