Hamilton's military career began in 1873 and he served in India and Africa. He was Chief of Staff to Lord Kitchener during the Boer War and was knighted in 1902.
Kitchener appointed Hamilton to command the Allied expedition to gain control of the Dardanelles straits from Turkey and capture Constantinople.
Aide-de-camp to Gen Sir Frederick Sleigh Roberts, 1st Bt, as Commander-in-Chief Madras, 1882-1884, and Commander-in-Chief East Indies, 1886-1890 (including Burma Expedition , 1886-1887)
Served with 1 Bn Gordon Highlanders during First Sudan Expedition , 1884-1885
Assistant Adjutant General for Musketry in Bengal, India, 1890-1893
Military Secretary to Gen Sir George Stuart White, Commander-in-Chief East Indies, 1893-1895
Assistant Adjutant General and Assistant Quarter Master General, Chitral Relief Force , North West Frontier, 1895
Deputy Quarter Master General in India, 1895-1898
Officer commanding 1 Bde and 3 Bde, Tirah Expeditionary Force , North West Frontier, 1897-1898
Commandant, School of Musketry , Hythe, Kent, 1898-1899
Assistant Adjutant General and Chief of Staff, Natal Field Force , 1899, and Maj Gen commanding 7 Bde, Second Boer War, South Africa, 1899-1900
Lt Gen, commanding Mounted Infantry Div, Second Boer War, South Africa, 1900-1901