第四次対仏大同盟
From 1795 Eugen was governor of the fortress of Glogau. In the War of the Fourth Coalition, at the Battle of Jena-Auerstedt he commanded the Reserve cavalry of the Prussian Army. On 18 October 1806 he fought at the Battle of Halle where he was defeated by Marshal Jean Bernadotte (later became King Charles XIV John of Sweden).