Robert B. Allman served as the Principal Medical Officer of the Oil Rivers/Niger Coast Protectorate in 1891. He served in the Cross River, Eket and Okrikar expeditions, 1895–96; British Military Campaign on Benin, 1897; Oron expedition, 1897; Ekuri expedition, 1897–98; Ubium and Ishan expeditions, 1899; and Aro expedition, 1901–2. In 1901, he was a member of the Committee at the Colonial Office for Reorganisation of the West African Medical Staff (British Museum website).