rapid expansion in the later half of the 19th century, with its ships becoming larger and more luxurious. One particularly notable ship of the era was the SS Ravenna, built in 1880, which became the first ship to be built with a total steel superstructure. In 1847, shortly after the Opium War, P&O entered the opium trade; shipping 642,000 chests of Bengal and Malwa opium in the next eleven years. They faced stiff competition from the incumbent shippers, Jardines and the Apcar Line. Early 20th century years: 1900–1945 Mail contracts were the basis of P&O's prosperity until the Second World War, but the company also continued to become a major commercial shipping line and passenger liner operator. In 1914, it took over the British India Steam Navigation Company, which was then the largest British shipping line, owning 131 steamers. In 1918, it gained a controlling interest in the Orient Line, its partner in the England-Australia mail route. Further acquisitions followed and the fleet reached a peak of almost 500 ships in the mid-1920s. In 1920, the company also established a bank, P&O Bank, that it sold to Chartered Bank of India, Australia and China (now Standard Chartered Bank) in 1927. At this time it established a commercial relationship with Spinney's of Haifa, that developed into a major regional high-end grocery store chain, which eventually provided shipping services access to much of the Middle East. Until 1934 it operated liners from Key West, Florida to Havana; then it operated from Miami to Cuba until 1960. In 1932, P&O expanded their passenger operations to Australia, with the introduction of Strathaird, which departed on a cruise to Brisbane and Norfolk Island. Eighty-five of the company's ships were sunk in the First World War and 179 in the Second World War. Post war: 1945–2000 After 1945, the passenger market declined to India, but boomed to Australia with the advent of paid-passages for literate and healthy European immigrants known as Ten Pound Poms. P&O built 15 large passenger liners, including , , , and , culminating in and , which were an unprecedented speed and size. By 1968, over 1 million immigrants had arrived—many via P&O—and Australia ended the programme. P&O entered the cruise market and began to sell and scrap many of these liners. It concentrated mainly on cargo ships. It entered the tanker trade in 1959 and the roll-on roll-off (RORO) ferry business