and maps identified the Tonbs as part of Langeh, subject to the government of the province of Fars. Chief among them were the works of Lt. John McCluer (1786), political counselor John Macdonald Kinneir (1813), and Lt. George Barns Brucks (1829). 19th century In 1835, the Bani Yas attacked a British ship off Greater Tonb. In the ensuing maritime peace arranged by the British Political Resident Samuel Hennell, a restrictive line was established between Abu Musa and Sirri islands, and pledges were obtained from the tribes of the lower Persian Gulf not to venture their war boats north of the line. In view of Sirri and Abu Musa being pirate lairs themselves, Hennell's successor, Major James Morrison, in January 1836, modified the restrictive line to run from Sham on the Trucial Coast to a point ten miles south of Abu Musa to Sáir Abu Noayr island. In either of its configurations, the restrictive line placed the Tonbs outside of the reach of the war boats of the Qasemi, Bani Yas, and other tribes of the lower Persian Gulf. The 1835 maritime truce was made permanent in 1853 after a series of earlier extensions. Force being no longer a viable option for settlement of disputes, especially on the part of the Qasemi of the lower Persian Gulf, the enforcement of Qasemi's claims to islands such as Abu Musa and Greater Tonb became a subject for the British colonial administration in the Persian Gulf. In that context, the Resident and its agents on several occasions (1864, 1873, 1879, 1881) had been seized with the question of the ownership of the Tonbs, but the British government had refused to go along with the claims of the Qasemi of the lower Persian Gulf. In the period 1836–86, the official British surveys, maps, and administrative reports continued to identify the Tonbs as part of Langeh, subject to the government of Fars province. Among them were the works of Lt. Colonel Robert Taylor (1836), the Resident A.B. Kemball (1854), the Resident Lewis Pelly (1864), The Persian Gulf Pilot (1864), an admiralty publication, the 1870 (second) edition of The Persian Gulf Pilot, and the 1886 Map of Persia, which was issued by the intelligence branch of the British war office and showed the Tonbs in the colour of Persia. Until this date (1886), the British acknowledged Persian ownership of the islands. In February 1887, the Persian central