The War of the Third Coalition (1805-1806) was a major European conflict during the Napoleonic Wars (1803-1815). It was fought by an alliance of nations that included the United Kingdom, Russia, Austria, Sweden, Naples, and Sicily, against the First French Empire of Napoleon I (r. 1804-1814; 1815), its client states, and its reluctant ally of Spain. #History #BattleOfTrafalgar #CoalitionWars #FirstFrenchEmpire #HistoryFacts https://www.worldhistory.org/War_of_the_Third_Coalition/