 On May 1, 1683, the Ottoman Empire attacked the Holy Roman Empire and besieged Vienna on July 14, 1683.On September 6 the Polish army under John III Sobieski arrived in Tulln and united with imperial forces and additional troops from Saxony, Bavaria, Baden, Franconia and Swabia who had answered the call for a Holy League that was supported by Pope Innocent XI.The Ottoman army, totaling around 150,000 men under Kara Mustafa Pasha, was defeated on September 11, 1683.