|Battle of Gorjani|
|Part of the Little War in Hungary and Hundred Years' Croatian–Ottoman War|
|Commanders and leaders|
|Pavle Bakić †||Semendireli Mehmed Pasha(Governor of Belgrade)|
|Casualties and losses|
|20,000 killed||few hundreds|
The Battle of Gorjani (Croatian: Bitka kod Gorjana, German: Schlacht bei Gorjani) or Battle of Đakovo (Hungarian: Diakovári csata) was a battle fought on 9 October 1537 at Gorjani, a place in present-day Slavonia (today in eastern Croatia), between the towns of Đakovo and Valpovo, as part of the Little War in Hungary as well as the Hundred Years' Croatian–Ottoman War.
After seven years of war and the failed Siege of Vienna in 1529, the Treaty of Konstantiniyye was signed, in which John Zápolya was recognized by the Austrians as King of Hungary as an Ottoman vassal, and the Ottomans recognized Habsburg rule over Royal Hungary.
This treaty satisfied neither John Zápolya nor Austrian Archduke Ferdinand, whose armies began to skirmish along the borders. Ferdinand decided to strike a decisive blow in 1537 at John, thereby violating the treaty.
Very badly prepared, the siege came to nothing, because the allied army was decimated by disease and starvation before it could even besiege the city.
The army had to withdraw, and got stuck in the swamps of Gorjani, near Đakovo and Valpovo on the Drava river, and their entire heavy armament was lost. Katzianer fled with the cavalry and abandoned his army. Count Ludwig Lodron remained to engage the Ottoman relief army that had pursued them (led by border commanders), but the entire force was annihilated.
This campaign was a disaster of similar magnitude to that of Mohács and therefore nicknamed the Austrian Mohacs. The news of the defeat came as a shock in Vienna and a new Treaty of Nagyvárad was signed in 1538.
Katzianer was arrested, and Nikola Jurišić took his place as the commander of Croatian defence. Some time later, Katzianer escaped the Vienna prison and hid at the Zrinski estates, until he lost Zrinski's favor, and was thus executed.