Рейнский союз
The Emperor Francis II elevated him to the rank of Duke in 1807. After the dissolution of the Holy Roman Empire, Alexius Frederick Christian, with his kinsmans the Dukes of Anhalt-Dessau and Anhalt-Köthen, joined the Confederation of the Rhine. Some of his troops fought for Napoleon in Tyrol, Spain, Russia, Gdańsk, and Kulm. On 13 December 1813 he resigned from the Confederation of the Rhine and sent his troops with his allies in 1814 and 1815 to Belgium and France. On 8 June 1815 he joined the German Confederation.