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Staging the battle

In an effort to stop the siege, the relief army of Poles and Imperial forces would rush to prepare a response. Despite the multinational composition of the army and the short space of only six days, an effective leadership structure was established, centred around the king of Poland and his heavy cavalry (Polish Hussars). The Holy League settled the issue of payment by using all available funds from the government, loans from several wealthy bankers and noblemen and large sums of money from the Pope. The Habsburgs and Poles also agreed that the Polish government would pay for its own troops while still in Poland, but that the Emperor would fund them once they crossed into imperial territory. However, the Emperor would recognize Sobieski's claim to first rights of plunder of the enemy camp in the event of a victory.

The combined besieging forces, led by Kara Mustafa, were less united and facing problems with motivation and loyalty, and struggled to prepare for the expected relief-army attack. Mustafa had entrusted defense of the rear to the Khan of Crimea and his cavalry force, which numbered between 30,000 and 40,000. There is doubt as to how much the Tatars participated in the final battle before Vienna. Their Khan refused to attack the relief force as it crossed the Danube on pontoon bridges and also refused to attack them as they emerged from the Vienna Woods. The Ottoman allies of Wallachia and Moldavia would also prove unreliable. George Ducas, Prince of Moldavia, was captured. Șerban Cantacuzino, who sympathized with the Christian Coalition, joined the retreat after Sobieski's cavalry charge. Cantacuzino had negotiated with the Imperial forces for Wallachia to join the Christian side, longing for the position of protector of Christians in the Balkan Peninsula. In turn, the Habsburgs promised him the throne of Constantinople which was the capital of the Ottoman Empire.

The confederated troops signalled their arrival on the Kahlenberg above Vienna with bonfires. The forces in the city of Vienna responded by sending Jerzy Franciszek Kulczycki, a Polish nobleman, diplomat and trader fluent in Turkish, on a successful spy mission to penetrate the Turkish forces and notify the relief troops of when the joint attack was to be made.