In December 1807, he traveled to Paris, to try to reduce the war burdens imposed on Prussia by Napoléon Bonaparte; he only managed to obtain a modest reduction.

Later he led the 8th Brigade of the Yorck's army corps on the Rhine and distinguished himself by bravery and military skills at the battles of Château-Thierry, Laon and outside Paris.

After the Treaty of Paris (1814), the Prince accompanied the king to London and then attended the negotiations of the Congress of Vienna.

In this capacity, on 20 September 1831 he opened the first rail line on German soil from Hinsbeck via the Deilbach valley to Nierenhof.

After the death of his wife, Marie Anna, on 14 April 1846, he withdrew from public life at his Fischbach castle.