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
Revolutions of 1848 in the Austrian Empire hired a new commander and attempted to unite with Romanian democrat Avram Iancu, who was known as "Crăişorul Munţilor" ("The Prince of the Mountains"). However, division and mistrust were too severe. Three days after the start of hostilities in Italy, Charles Albert of Sardinia abdicated the throne of Piedmont-Savoy, essentially ending the Piedmontese return to war. Renewed military conflicts cost the Empire the little that remained of its finances. Another challenge to Habsburg authority came from Germany and the question of either "big Germany" (united Germany led by Austria) or "little Germany" (united Germany led by Prussia). The Frankfurt National