Suez isthmus in 1830, stopping at Aden with the sultan's consent to resupply with coal. Although cargo was still carried around the Cape of Good Hope in sailing ships, a steam route to the Suez could provide a much quicker option for transporting officials and important communications. Grant felt that armed ships steaming regularly between Bombay and Suez would help secure British interests in the region and did all he could to progress his vision. After lengthy negotiations due to the costs of investing in the new technology, the government agreed to pay half the costs for six voyages per year and the East India Company board approved the purchase of two new steamers in 1837. Grant immediately announced that monthly voyages to Suez would take place, despite the fact that no secure coaling station had been found. In 1838, under Muhsin bin Fadl, Lahej ceded including Aden to the British. On 19 January 1839, the British East India Company landed Royal Marines at Aden to secure the territory and stop attacks by pirates against British shipping to India. In 1850 it was declared a free trade port, with the liquor, salt, arms, and opium trades developing duties as it won all the coffee trade from Mokha. The port lies about equidistant from the Suez Canal, Mumbai, and Zanzibar, which were all important British possessions. Aden had been an entrepôt and a way-station for seamen in the ancient world. There, supplies, particularly water, were replenished, so, in the mid-19th century, it became necessary to replenish coal and boiler water. Thus Aden acquired a coaling station at Steamer Point and Aden was to remain under British control until November 1967. Until 1937, Aden was governed as part of British India and was known as the Aden Settlement. Its original territory was enlarged in 1857 by the island of Perim, in 1868 by the Khuriya Muriya Islands, and in 1915 by the island of Kamaran. The settlement would become Aden Province in 1935. In 1937, the settlement was detached from India and became the Colony of Aden, a British Crown colony. The change in government was a step towards the change in monetary units seen in the stamps illustrating this article. When British India became independent in 1947, Indian rupees (divided into annas) were replaced in Aden by East African shillings. The hinterland of Aden and Hadhramaut were also loosely tied to