Battle of Jena–Auerstedt
Jena, GermanyThe twin battles of Jena and Auerstedt were fought on 14 October 1806 on the plateau west of the river Saale, between the forces of Napoleon I of France and Frederick William III of Prussia. The decisive defeat suffered by the Prussian Army subjugated the Kingdom of Prussia to the French Empire until the Sixth Coalition was formed in 1813.