An engraving of Hong Kong from a drawing by Thomas Allom. In 1839, the refusal by Qing Dynasty authorities to import opium resulted in the First Opium War between China and Britain. Hong Kong Island was occupied by British forces on 20 January 1841 and was initially ceded under the Convention of Chuenpee as part of a ceasefire agreement between Captain Charles Elliot and Governor Qishan, but the agreement was never ratified due to a dispute between high ranking officials in both governments. It was not until 29 August 1842 that the island was formally ceded in perpetuity to the United Kingdom under the Treaty of Nanking. The British established a crown colony with the founding of Victoria City the following year.