Editing 1805 (section)

=== October–December ===
* [[October 14]] – [[Napoleonic Wars]]: [[War of the Third Coalition]] – [[Ulm Campaign]]: [[Battle of Elchingen]] – An Austrian corps under [[Johann Sigismund Riesch|Johann von Riesch]] is defeated by [[Michel Ney|Marshal Ney]], near [[Elchingen]], Bavaria.
* [[October 16]]–[[October 19]] – [[War of the Third Coalition]]: [[Ulm Campaign]] – [[Battle of Ulm]]: Austrian General [[Karl Mack von Leiberich|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 23]]
**  On the early death of her husband, [[Madame Clicquot Ponsardin]] takes over his champagne wine business in France as [[Veuve Clicquot]].
** British [[Aeneas (troopship)|troopship ''Aeneas'']] is wrecked off [[Newfoundland (island)|Newfoundland]] with the loss of 340 lives.<ref>{{cite book|last=Grocott|first=Terence|title=Shipwrecks of the Revolutionary & Napoleonic Eras|publisher=Caxton Editions|year=2002|isbn=1-84067-164-5}}</ref>
* [[October 31]] – Sweden, led by [[Gustav IV Adolf of Sweden|King Gustav IV Adolf]], declares war on France.<ref>H. Arnold Barton, ''Scandinavia in the Revolutionary Era: 1760–1815'' (University of Minnesota Press, 1986) p267</ref>
* [[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]] – [[Ludwig van Beethoven|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 {{convert|1007|ft|m|abbr=on}} long and {{convert|126|ft|m|abbr=on}} 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 (1805)|Peace of Pressburg]] between France and Austria is signed in the [[Primate's Palace, Bratislava|Primate's Palace]], Pressburg (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".<ref>Thomas Carlyle, ''The French Revolution'' (Courier Corporation, 2012) p210</ref>