8 October — The Second Opium War between several western powers, including the United Kingdom, and China begins with the Arrow Incident on the Pearl River.
1 November — Anglo-Persian War: War is declared between Britain and Persia.
November — The first known rules of modern croquet are registered by Isaac Spratt in London.[8]
1 December — Under the County and Borough Police Act, in any county or area where a police force has not already been established, the Justices of the Peace must from this date take steps to create one according to nationally defined standards.[9]