The treaty of Constantinople had satisfied neither…
October 1537 CE
The treaty of Constantinople had satisfied neither John Szapolyai nor Austrian Archduke Ferdinand, whose armies begin to skirmish along the borders.
A charter dated September 20, 1537, titles Pavle Bakic as Despot and called all Serbs to join Bakić as the Serbian Despot.
Attempts made by King Ferdinand to push the Ottomans out of Slavonia, with the use of Pavle, are not successful.
Ferdinand decides to strike a decisive blow in 1537 at John, thereby violating the treaty.
A combined force of Austrians and Bohemians, twenty-four thousand strong, unsuccessfully besieges the Ottoman fortress of Osijek in 1537, in response to depredations by Ottoman soldiers in the region, a violation of the truce of 1533 ending the previous Austro-Turkish War.
The siege, very badly prepared, comes to nothing, because the allied army is decimated by disease and starvation before it can even besiege the city.
The army has to withdraw, and …