page_title: 1805
section_title: October–December
hierarchical_section_title: 1805 / Events / October–December
context_page_description: 1805 was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1805th year of the Common Era and Anno Domini designations, the 805th year of the 2nd millennium, the 5th year of the 19th century, and the 6th year of the 1800s decade. As of the start of 1805, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
  After thirteen years the First French Empire abolished the French Republican Calendar in favour of the Gregorian calendar.
context_section_description: October 14 – Napoleonic Wars – War of the Third Coalition – Ulm Campaign – Battle of Elchingen: An Austrian corps under Johann von Riesch is defeated by Marshal Ney, near Elchingen, Bavaria.
  October 16–19 – War of the Third Coalition – Ulm Campaign – Battle of Ulm: Austrian General Mack von Leiberich is forced to surrender his entire army to Napoleon, after being surrounded.
  October 21 – Napoleonic Wars – War of the Third Coalition – Battle of Trafalgar: The British fleet, led by Admiral Horatio Nelson, defeats a combined French and Spanish fleet off the coast of Spain; however, Admiral Nelson is fatally shot.
  October 31 – Sweden, led by King Gustav IV Adolf, declares war on France.
  November 7 – The Lewis and Clark Expedition arrives at the Pacific Ocean.
  November 11 – Napoleonic Wars – Battle of Dürenstein: 8,000 French troops attempt to slow the retreat of a vastly superior Russian and Austrian force.
  November 16 – Napoleonic Wars – Battle of Schöngrabern: Russian forces, under Pyotr Bagration, delay the pursuit by French troops under Joachim Murat.
  November 20 – Beethoven's only opera Fidelio, in its original form (known retrospectively as Leonore), is premiered at the Theater an der Wien in Vienna, which at this time is under French military occupation.
  November 26 – The Pontcysyllte Aqueduct is opened in Wales; it is 1,007 ft (307 m) long and 126 ft (38 m) tall.
  December 2 – Napoleonic Wars: Battle of Austerlitz – French troops under Napoleon decisively defeat a joint Russo-Austrian force.
  December 26 – The Peace of Pressburg between France and Austria is signed in the Primate's Palace, Pressbury (modern-day Bratislava).
  December 31 – The French Republican Calendar (which featured a 10-day week until 1802) is used for the last time, 8 days after being annulled by Napoleon, with the final official date being "9 Nivôse in Year XIV of the Revolution".
caption: December 2: Battle of Austerlitz
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