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 counter-revolution in the Austrian Empire. Lombardy-Venetia was quickly brought back under Austrian rule in the mainland, even because popular support for the revolution vanished: revolutionary ideals were often limited to part of middle and upper classes, which failed both to gain "hearts and minds" of lower classes and to convince the population about Italian nationalism. Most part of lower classes indeed were quite indifferent, and actually most part of Lombard and Venetian troops remained loyal. The only widespread support to the revolution was in the cities of Milan and Venice, with the Republic of San Marco lasting under siege until