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The lucrative trade between China and Britain in the 19th century comprised mainly [[tea ]] and [[opium trade|opium]]. Opium addiction became such a problem that the Qing Dynasty tried to prevent the import. They closed the waterway up to [[Canton]] and seized over 1 million kilograms of opium requiring merchants to enter into a bond not to deal in the drug. [http://books.google.co.uk/books?id=FzPZcyAGzT0C&pg=PA1&lpg=PA1&dq=Captain+Charles+Elliot,+R.N.,+Chief+Superintendent+of+British+Trade+in+China&source=bl&ots=7FspVCNamQ&sig=8DyezNem9h7hDcZkIiTjhCwyQcs&hl=en&ei=7NzeSr3RK4me4QahlLUS&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAoQ6AEwAA#v=onepage&q=Captain%20Charles%20Elliot%2C%20R.N.%2C%20Chief%20Superintendent%20of%20British%20Trade%20in%20China&f=false Captain Charles Elliot RN], Chief Superintendent of British Trade in China, tried to negotiate with the Chinese but was continually rebuffed. There were naval confrontations on the Pearl River and Britain sent an expeditionary force from [[Singapore]]. The Bogue Forts at the mouth of the river and subsequently [[Canton]] were captured. The Chinese were also defeated at the mouth of the Yangtse River and [[Shanghai]] was occupied. The war ended in August 1842 with the Treaty of Nanking which opened five treaty ports to trade, ceded [[Hong Kong]] and granted an indemnity to Britain.