The Battle of Vienna (; or odsiecz wiedeńska; Modern Turkish: İkinci Viyana Kuşatması, Ottoman Turkish: Beç Ḳalʿası Muḥāṣarası) took place in Vienna on 11th and concluding on the 12th of September 1683 after the imperial city of Vienna had been besieged by the Ottoman Empire for two months. The battle was fought by the Holy Roman Empire of the German Nations in league with the Polish-Lithuanian Commonwealth (Holy League) against the invading Muslim Ottoman Empire and chiefdoms of the Ottoman Empire, and took place at Kahlenberg Mountain near Vienna. The battle marked the first time Poland and the Holy Roman Empire had cooperated militarily against the Turks, and it is often seen as a turning point in history, after which "the Ottoman Turks ceased to be a menace to the Christian world". In the ensuing war that lasted until 1698, the Turks lost almost all of Hungary to the Holy Roman Emperor Leopold I.