Revolutions of 1848 in the Austrian Empire of the Serbs in Austrian Empire was held between 1 and 3 May 1848 in Sremski Karlovci, during which the Serbs proclaimed autonomous Habsburg crownland of Serbian Vojvodina. The war started, leading to clashes as such in Srbobran, where on July 14, 1848, the first siege of the town by Hungarian forces began under Baron Fülöp Berchtold. The army was forced to retreat due to a strong Serbian defense. With war raging on three fronts (against Romanians and Serbs in Banat and Bačka, and Romanians in Transylvania), Hungarian radicals in Pest saw this as an opportunity. Parliament made concessions to
History of the Catholic Church in Germany various states within the Empire to increase their power and the Emperor's attempt to achieve the religious and political unity of the Empire. The immediate occasion for the war was the uprising of the Protestant nobility of Bohemia against the emperor (Defenestration of Prague), but the conflict was widened into a European War by the intervention of King Christian IV of Denmark (1625–29), Gustavus Adolphus of Sweden (1630–48), and France under Cardinal Richelieu, the regent of the young Louis XIV (1635–48). Germany became the main theatre of war and the scene of the final conflict between France and the Habsburgs