Hieronim Lubomirski had already been fighting the Turks to help Emperor Leopold, and Sobieski quickly marched his 25,000 men to the Vienna battlefield area, where they complemented an allied army of 70,000 total, comprised also of Austrians and Germans. Sobieski took command of the attack on the besiegers and the main battle took place on September 12, 1683. Heavily involved in the fighting were the Commonwealth infantry, artillery and cavalry. Thousands of the Polish Hussar horsemen were famously involved in the victorious assault on Kara Mustafa's camp. The Ottoman offensive capabilities were broken, even though Kara Mustafa was able to save from the rout a portion of his retreating army. Vienna, the gateway to the West, was spared the fate of Constantinople.