Alexander joined the Headquarters of the Serbian Army, and was promoted to the rank of Lieutenant and appointed as adjutant to Prince Mihailo.

Having had his title acknowledged by Russia and Turkey, Prince Aleksandar started the reforms and founded a number of new institutions in order to improve the progress of the Serbian state.

[3] During the Hungarian Revolution in Vojvodina, in 1848, Prince Aleksandar Karađorđević sent Serbian volunteers under the command of Stevan Knićanin to help the Serbs’ struggle for autonomy.

The result was his overthrow and departure into exile in 1858 by the winners of the Powers in the war and bringing the rival Obrenović dynasty to the throne of the Principality of Serbia.

[4] The popularity of the pro-Austrian Prince Alexander Karađorđević, declined dramatically after the Treaty of Paris left Serbia with no concessions at the end of the Crimean War.

He was buried in Vienna, and his earthly remains were moved in 1912 to the Memorial Church of St. George built by his son Petar I Karađorđević, in Oplenac, Serbia.