Fulfilling the obligations specified in the treaty signed with Emperor Leopold I on 31 March 1683, Jan III Sobieski sets off on a mission to relieve Vienna besieged by Turkish troops. On 12 September 1683 the decisive clash takes place. As commander-in-chief of the Christian forces, Sobieski charges at the enemy with Polish winged Hussars (heavy cavalry), which leads to his victory. Vienna is rescued, Visier Kara Mustafa flees the battlefield and the power of the Ottoman Empire is crushed.