He served in the American War of Independence on the staff of Sir Henry Clinton.

Together they raised eight children, including three who were to become famed military officers: In 1785 he moved his family to Celbridge in County Kildare, Ireland, where George eventually earned a post as Comptroller of Army Accounts.

[2] During the Irish Rebellion of 1798, in which one of the rebel leaders was his nephew Lord Edward FitzGerald, he is said to have armed his five sons, put his house in a state of defence, and offered an asylum to all who were willing to resist the insurgents.

[3][4] In 1999, a 6-part miniseries called Aristocrats, based on the lives of Sarah Lennox and her sisters, aired in the U.K. George Napier appears at various ages in the series, played by Martin Glyn Murray and Jeremy Bulloch.

[5] It is incorrectly stated that George Napier's grandson, Colonel Napier, brought the first pair of skis to Davos in 1888, starting the popular sport of Alpine skiing that had formerly been the activity of a few experts.