 As an adult, Lord Caledon was elected to sit in the House of Lords as a Representative Peer for Ireland in 1877 and was Deputy Lieutenant of County Tyrone.He gained the rank of Captain in the service of the 1st Life Guards, became a Major serving with the 4th Battalion, Royal Inniskilling Fusiliers and fought in the Egyptian Campaign in 1882.He was also invested as a Knight of the Order of St Patrick on 14 November 1896.