8 March – American Revolutionary War: the League of Armed Neutrality is formed by Russia with Denmark and Sweden to try to prevent the Royal Navy from searching neutral vessels for contraband.[2]
7 June – the Gordon Riots are ended by the intervention of troops. About 285 people are shot dead, with another 200 wounded and around 450 arrested, of whom around 25 will be executed.
9–20 October – Great Hurricane of 1780 in the Caribbean: At least a dozen ships of the Royal Navy, stationed in the area because of the American Revolutionary War, are totally lost, many with all (or most) hands, and others damaged; hundreds of sailors are killed.
20 November – American Revolutionary War: Britain declares war on the Dutch Republic to stop it from joining the League of Armed Neutrality.[2]
30 November – American Revolutionary War: The San Juan Expedition is forced to withdraw.
^ abcPenguin Pocket On This Day. Penguin Reference Library. 2006. ISBN0-14-102715-0.
^Berry, George (1970). Discovering Schools. Tring: Shire Publications. ISBN0-85263-091-3.
^Hattendorf, John (2000). Naval Policy and Strategy in the Mediterranean: past, present, and future. Taylor & Francis. p. 37. ISBN0-7146-8054-0.
^Harbron, John (1988). Trafalgar and the Spanish Navy. Conway Maritime Press. p. 84. ISBN0-85177-477-6.
^Edler, Friedrich (2001) [1911]. The Dutch Republic and The American Revolution. Honolulu: University Press of the Pacific. pp. 163–166. ISBN0-89875-269-8.