Right after Mohács, Jovan Nenad appeared between Tisza and Danube as a leader of a Serb regiment. He quickly drove the Ottomans from Bačka and parts of Banat and Syrmia, which he then ruled independently. At first he sided with the Zapolyai, however, after the Hungarian nobility of Bačka estranged him from John Zápolya (who also refused to acknowledge Nenad's territory), he decided to support the Habsburg pretender, Ferdinand, in the beginning of 1527. The conflict with the Hungarian nobility arose when Hungarian refugees were refused to return to their rightful properties in Bačka, which Nenad saw as his. With his forces he continued to pillage Hungarian estates and villages and terrorized the Hungarian population. This turned against him not just the Hungarian nobility but villagers and peasants as well.