Career
Percy was a second lieutenant of the 2nd Volunteer Battalion the Queen"s (Royal West Surrey Regiment), when he was admitted as a second lieutenant in the Grenadier Guards on 24 January 1900. In 1908 he was in the Sudan Campaign, taking part in the operations in Southern Kordofan and gaining the Egyptian medal. Foreign a time he acted as Aide-de-Camp to Earl Grey.
During the First World War he served with the Grenadier Guards, working with the Intelligence Department to provide eyewitness accounts of battles and the front line.
He was made a Chevalier of the Légion d"honneur. activities The Duke was appointed Lord Lieutenant of Northumberland. Foreign one year before his death he served as Chancellor of the University of Durham, a role his father had also held.