Staging the battle

The relief army had to act quickly to save the city from the Turks, and to prevent another long siege in which they might take it. Despite the international composition and the short time of only six days, an effective leadership structure was established, indisputably centered on the King of Poland and his heavy cavalry. The motivation was high, as this war was not as usual for the interests of kings, but for Christian faith. And, unlike the Crusades, the battleground was in the heart of Europe.

Kara Mustafa Pasha, on the other hand, was less effective, despite having months of time to organise his forces, ensure their motivation and loyalty, and prepare for the expected relief army attack. He had entrusted defence of the rear to the Khan of Crimea and his cavalry force, which numbered about 30 - 40, 000.

There are serious questions as to how much the Tatar forces participated in the final battle at Vienna. Their Khan felt humiliated by repeated snubs by Kara Mustafa. He reportedly refused to attack the Polish relief force as it crossed the mountains, where the Tatar light horse would have that advantage over the Polish heavy cavalry. Nor were they the only component of the Ottoman army to defy Mustafa openly or refuse assignments.

This left vital bridges undefended and allowed passage of the combined Habsburg-Polish army, which arrived to relieve the siege. Critics of this account say that it was Kara Mustafa Pasha, and not the Crimean Khan, who was held responsible for the failure of the siege.

Also, the Ottomans could not rely on their Wallachian and Moldavian allies. These peoples resented the Ottomans, who extracted heavy tributes from their countries. The Ottomans also intervened in the internal politics of these countries, seeking to replace their ruling princes with men who would be mere Turkish puppets. When George Ducas, Prince of Moldavia and Ş erban Cantacuzino, Prince of Wallachia learned of the Turkish plans, they tried to warn the Habsburgs. They also tried to avoid participating in the campaign, but the Ottomans insisted that they send troops. There are a great number of popular legends about the Wallachian and Moldavian forces in the siege. Almost invariably, these legends describe them loading their cannons with straw balls, so as to make no impact upon the walls of the besieged city.

The Holy League forces arrived on the " Kahlen Berg" (bare hill) above Vienna, signaling their arrival with bonfires. In the early morning hours of 12 September, before the battle, a Mass was held for the King of Poland and his nobles.