In February 1914, Buxton was appointed Governor-General of South Africa, and on 11 May of that year he was raised to the peerage as Viscount Buxton, of Newtimber in the County of Sussex. A revolt by some of the South African populace on the outbreak of the First World War temporarily threatened his safety, but the country's Prime Minister, General Louis Botha, immediately attached the Union of South Africa to Britain. Thereafter, Lord Buxton and General Botha formed an effective partnership, planning and executing South African actions in the war, including the invasion of the neighbouring German colony of South West Africa. Lord Buxton travelled widely throughout South Africa, and endeared himself to the people. Upon his retirement in 1920, the people demonstrated their affection for him. He continued his interest in South African affairs after returning to England, serving as president of the African Society from 1920 to 1933.