Battle of Jena–Auerstedt
14 October 1806
The Battle of Jena–Auerstedt was fought on Tuesday 14 October 1806, near Jena and Auerstedt (then in the Duchy of Saxe-Weimar and Kingdom of Prussia, now in Thuringia and Saxony-Anhalt, Germany), being the decisive engagement of the War of the Fourth Coalition. The Grande Armée under the command of Emperor Napoleon I defeated a combined Prussian and Saxon army.