Battle of Vienna – Second Islamic wave – Year 1683

The Battle of Vienna, Turkish: İ kinci Viyana Kuş atması), took place on 11 and 12 September, 1683 after Vienna had been besieged by the Ottoman Empire for two months. The battle broke the advance of the Ottoman Empire into Europe, and marked the political hegemony of the Habsburg dynasty in Central Europe.

The large-scale battle was won by Polish-Austrian-German forces led by King of Poland John III Sobieski against the Ottoman Empire army commanded by Grand Vizier Merzifonlu Kara Mustafa Pasha.

The siege itself began on 14 July 1683, by the Ottoman Empire army of approximately 90, 000 men. The sieging force was composed by 60 ortas of Jannisaries (12, 000 men paper strength) with an observation army of c.70, 000 men watching the countryside. The decisive battle took place on 12 September, after the united relief army of 84, 450 men had arrived, pitted against the Ottoman army.

The battle marked the turning point in the 300-year struggle between the forces of the Central European kingdoms and the Ottoman Empire. Over the sixteen years following the battle, the Habsburgs of Austria gradually occupied and dominated southern Hungary and Transylvania, which had been largely cleared of the Turkish forces.

The capture of the city of Vienna had long been a strategic aspiration of the Ottoman Empire, due to its inter-locking control over Danubean (Black Sea-to-Western Europe) southern Europe, and the overland (Eastern Mediterranean-to-Germany) trade routes. During the years preceding the second siege (the first one was in 1529), under the auspices of grand viziers from the influential Kö prü lü family, the Ottoman Empire undertook extensive logistical preparations this time, including the repair and establishment of roads and bridges leading into Austria and logistical centers, as well as the forwarding of ammunition, cannon and other resources from all over the Empire to these logistical centers and into the Balkans.

On the political front, the Ottoman Empire had been providing military assistance to the Hungarians and to non-Catholic minorities in Habsburg-occupied portions of Hungary. There, in the years preceding the siege, widespread unrest had become open rebellion upon Leopold I's pursuit of Counter-Reformation principles and his desire to crush Protestantism. In 1681, Protestants and other anti-Habsburg Kuruc forces, led by Imre Thö kö ly, were reinforced with a significant force from the Ottomans, who recognised Imre as King of " Upper Hungary" (eastern Slovakia and parts of northeastern present-day Hungary, which he had earlier taken by force of arms from the Habsburgs). This support went so far as explicitly promising the " Kingdom of Vienna" to the Hungarians if it fell into Ottoman hands.

Yet, before the siege, a state of peace had existed for twenty years between the Habsburgs and the Ottoman Empire, as a result of the Peace of Vasvá r.

In 1681 and 1682, clashes between the forces of Imre Thö kö ly and the Habsburgs' military frontier (which was then northern Hungary) forces intensified, and the incursions of Habsburg forces into Central Hungary provided the crucial argument of Grand Vizier Kara Mustafa Pasha in convincing the Sultan, Mehmet IV and his Divan, to allow the movement of the Ottoman Army. Mehmet IV authorised Kara Mustafa Pasha to operate as far as Győ r and Komarom castles, both in northwestern Hungary, and to besiege them. The Ottoman Army was mobilised on January 21, 1682, and war was declared on August 6, 1682.

The logistics of the time meant that it would have been risky or impossible to launch an invasion in August or September 1682 (a three month campaign would have got the Turks to Vienna just as winter set in). However this 15 month gap between mobilisation and the launch of a full-scale invasion allowed ample time for the Habsburg forces to prepare their defence and set up alliances with other Central European rulers, and undoubtedly contributed to the failure of the campaign. It proved most decisive that the Habsburgs and Poland concluded a treaty during this winter in which Leopold would support Sobieski if the Turks attacked Krakó w; in return, the Polish Army would come to the relief of Vienna, if attacked.

On March 31, 1683 another declaration, sent by Kara Mustafa on behalf of Mehmet IV, arrived at the Imperial Court in Vienna. On the next day the forward march of Ottoman army elements began from Edirne in Thracia. The troops reached Belgrade by early May, then moved toward the city of Vienna. About 40, 000 Crimean Tatar forces arrived 40km east of Vienna on 7 July, twice as many as the Austrian forces in that area. After initial fights, Leopold retreated to Linz with 80, 000 inhabitants of Vienna.

The King of Poland prepared a relief expedition to Vienna during the summer of 1683, honouring his obligations to the treaty. He went so far as to leave his own nation virtually undefended when departing from Krakó w on 15 August. Sobieski covered this with a stern warning to Imre Thö kö ly, the leader of Hungary, whom he threatened with destruction if he tried to take advantage of the situation — which Thö kö ly did.