Wilhelm (6 July 1785 –2 July 1823 ) Due to mental illness, Wilhelm was duke in name only, with his cousin Peter, Prince-Bishop of Lübeck, acting as regent throughout his entire reign.[5]
17 March – Prussia declares war on France, establishes Landwehr and introduces the Iron Cross military award (backdated to 10 March) and issues An Mein Volk proclamation
29–30 August – First Battle of Kulm: French Marshal Vandamme is defeated and captured, by allied Coalition forces from Russia, Prussia and Austria.
4 September: In the gaming records of Hans Carl Leopold von der Gabelentz the name of Germany's national card game, "Scat" (now Skat, appears for the time.
8 October – Treaty of Ried – Bavaria allies with the Coalition against France
14 October – Bavaria declares war on France
16–19 October – Battle of Leipzig: Napoleon is defeated by the forces of the Sixth Coalition. More than 600,000 troops are in the field, with well over 20% killed, wounded or missing. Many of the German states forming the Confederation of the Rhine defect from Napoleon to the Coalition, as a result of the battle.
8 December – Ludwig van Beethoven's Symphony No. 7, together with his Wellington's Victory, are premiered in Vienna under the composer's baton, in a benefit concert for Austrian and Bavarian soldiers wounded at the Battle of Hanau.
Gerhard Schildt: Von der Restauration zur Reichsgründungszeit, in Horst-Rüdiger Jarck / Gerhard Schildt (eds.), Die Braunschweigische Landesgeschichte. Jahrtausendrückblick einer Region, Braunschweig 2000, pp. 753–766.