The Battle of Sisak (; ; ) on June 22 1593 was fought between Ottoman forces of the Bosnian governor-general, Proceedings of the Meeting from 06/18/93 to 06/19/93. Zagreb-Sisak 1994 ISBN/ISSN 9-531-75024-4, pp. 125 - 130 or Beylerbeyi, Hasan Pasha Predojević, and Christian forces of the Holy Roman Empire under the supreme command of the Styrian general Ruprecht von Eggenberg. The Croatian troops were led by the Ban of Croatia, Tamás Erdődy, and some forces from the Duchy of Carniola were led by Andreas von Auersperg (), nicknamed the "Carniolian Achilles".

The battle took place at Sisak, now central Croatia, at the confluence of the rivers Sava and Kupa and resulted in crushing defeat for the Ottomans.

Background

Although the central authorities of both the Ottoman Empire and Austria were rather reluctant to fight each other after several campaigns on Hungarian and Moldovian land and four renewals of the 1547 truce, from either side large scale raids were mounted into each other’s territories: There had been numerous raids into Hungary by Akinci, the irregular Turkish light cavalry, and on the other hand, Christian Uskoks (Catholic refugees from Croatia, Dalmatia, Serbia and Albania) were being encouraged to conduct raids into Ottoman territory on the Balkans. "These Uskok raids became so damaging that the Bosnian provincial forces replied with a savage raid across the Urina and Sava, capturing a number of major Habsburg forts and taking so much booty" Stanford J. Shaw, History of the Ottoman empire and Modern Turkey. Vol. 1: Empire of Gazis, Cambridge: Cambridge University Press 1976 ISBN 0-521-29163-1 p.184 that Habsburg had to react. According to Stanford J. Shaw “the emperor renounced the peace treaty (October 1592) and sent a force that routed the Ottomans at Sissek/Siska. "

The Battle

In spring 1593, without a declaration of war, the Governor-General of Bosnia, Hasan Pasha, with his provincial army crossed the Kupa River, then the border between Ottomans and Austria as agreed upon in a treaty concluded between Habsburg and the High Porte at Adrianople (Turkish: Edirne) only a year earlier.

According to historic tradition the Ottoman forces that attempted to take Sisak fortress were six times superior in numbers, although three times is probably closer to reality. In any case, it was a local, provincial army and their contingent of elite troops must have been but small. Pounding the massed attackers with heavy artillery fire, the Austrian and Croat defenders broke the Ottoman siege and pushed the enemy towards the Kupa river. Caught in the middle between two Christian army flanks, the attackers panicked and started a chaotic retreat. Disintegrating under the unending cannonade, the bulk of the army with all the commanders are said to have drowned in the Kupa river.

The commander-in-chief of the Ottoman force, Hasan Pasha, did not survive the battle. The figures concerning the Ottoman losses vary from 8,000 to a bragging and vainglorious 20,000, as legend has it, which contrasts sharply with one author’s statement that there was only a total of 12,000 Ottoman troops involved who faced 5,000 Croats reinforced by forces from Styria and Carniola. Christian losses are said to have numbered only between 40-50 men.
Christian Europe, which after relieving Spain of the Arabic Muslims had identified the Ottoman Empire with the Islamic menace, was delighted at the reports of such an allegedly grandiose victory. King Philip II of Spain congratulated and Pope Clement VIII praised the Christian military leaders. The traditional daily ringing of the small bell of Zagreb cathedral at 2 p.m. is in memory of the battle as it was the bishop of Zagreb who had born the major part of the costs of the fortress of Sisak.

Consequences

Although as a consequence of this unexpected defeat of one of his underlings, only weeks later, on July 29, 1593, the Ottoman ruler, Sultan Murad III, declared war on Emperor Rudolf II this battle meant a redress of the balance of power along the Croat-Ottoman border, which since the Battle of Krbava field a century before in 1493 had been in total disequilibrium in favour of the High Porte
The defeat brought the expansion of the Ottoman Empire into Central Europe to a temporary halt and allowed Croatia and Inner Austria with the duchies of Styria, Carinthia and Carniola to remain free from Turkish control, while the Habsburgs managed to affirm their position in those territories. Due to supply difficulties, however, the Austrians did not really manage to put this local victory to proper use, which allowed Ottomans to recover quickly and retaliate so that the ensuing war, the Second Habsburg-Ottoman War, Long War, or Thirteen Years' War, did not end until the Peace of Zsitvatorok, or Žitava in November 1606. A 50-year period of comparable peace followed, beneficial to both sides which were then able to concentrate on internal problems.

Interpretation of the Significance

As the Battle of Sisak took place on Croatian territory and the main body of the Christian defenders consisted of Croatian troops, the victory has ever since played a major role in the traditional interpretation of the history of Croatia. As fighters from neighbouring Carniola re-enforced the defenders, it is Slovenian tradition to claim a major share in the victory. There are even Slovene sources that mention one nobleman Adam Rauber, "who entered history as the winner in the Battle of Sisak" . without even mentioning any Austrian or Croat commanders or troops.

Both in Croatia and in Slovenia the fact that after this battle no serious incursion into Croatian or Slovene territory by Ottoman raiders took place is generally attributed to this victory, which is declared to have even spared much of Western Europe the Turkish yoke. From both the Croat and Slovene points of view the battle was the decisive turning point in Christian-Muslim relations, a splendid historic victory by which, practically, the whole of Christian Europe was relieved of great danger.

This battle meant the final victory over the 300-years-old Turkish nuisance, which had much too long hindered the progress of the then Duchy of Kranjsko (Carniola) as the bastion of the entire Western Europe. The victory over the more than three times stronger Turkish troops practically brought salvation to the whole Christian Europe,

However, there are also more reasonable interpretations: We cannot accept and agree that "the two-hour long battle" against the Turks at Sisak, in which Slovenes were also involved, should be celebrated with such fervour''.

Recent analysis of several hitherto unknown or unused Ottoman sources has shown that there seems to have been a conflict of interest between the policy of the central Ottoman administration and the aims of Hasan Pasha­, the belligerent Governor-General of Ottoman Bosnia. It appears that the struggle for more land and power was an important incentive for the offensive action on the side of the Bosnian sipahis, an action which at that time was not really in accordance with Constantinople/ Istanbul. The Sultan, on the other hand, may have felt that such an embarrassing defeat even of a vassal acting off his own bat could not go unavenged if he himself was not to lose face.

Whichever way one looks at it, whether it is seen as a major victory of Christian defenders over Islamic aggressors, or a bloody, yet minor combat between neighbouring provinces, the Battle of Sisak was the prelude to the long Second Ottoman-Habsburg War, and both empires experienced five more of such wars until 1791: 1592-1606, 1660-1664, 1683-1699, 1716-1718, 1737-1739, 1788-1791.