Chiến dịch Hungary 1527–1528

The Hungarian Civil War (Hungarian: magyar belháború) or campaign of 1527–1528 was launched by Ferdinand I, Archduke of Austria and King of Hungary and Bohemia and his Hungarian followers against the Ottoman Turks. Following the Battle of Mohács, the Ottomans were forced to withdraw as events elsewhere in their now massive Empire required the Sultan's attention. Seizing upon their absence, Ferdinand I attempted to enforce his claim as King of Hungary. In 1527 he drove back the Ottoman vassal John Zápolya and captured Buda, Győr, Komárom, Esztergom, and Székesfehérvár by 1528. Meanwhile, the Ottoman Sultan, Suleiman the Magnificent, took no action at this stage despite the pleas of his vassal.

The civil war was preceded by the death of Louis II of Hungary and the subsequent siege of Buda by the Turks. During this era Hungary broke into 3.: Royal Hungary, Kingdom of Eastern Hungary (or Kingdom of Zápolya) and Ottoman Hungary (and some self-governing regions). In the Kingdom of Croatia in personal union with Hungary there was also a division and military conflict between the supporters of Ferdinand I and John Zápolya. Zápolya's followers invoked the decision of the Diet of the Estates, while Ferdinand's followers invoked the blood relationship between the Árpád dynasty and the House of Habsburg (from the First Congress of Vienna).