The mantle of Mohammed fell upon his son Achmet, who succeeded him in his office, inherited his ability, and pursued his policy. [Sidenote: =Attack upon Hungary under Achmet Kiuprili, 1663.=] Placing himself at the head of 200,000 men he burst into Austrian Hungary in 1663, crossed the Danube at Gran, captured the fortress of Neuhäusel, and ravaged Moravia up to the walls of Olmütz. But Louis XIV., irritated at the insult offered to his ambassador by Mohammed Kiuprili, came to the aid of the Emperor. With the assistance of 30,000 men in French pay Montecuculli the imperialist general felt himself strong enough to threaten the Turkish flank by an advance from Vienna. Achmet at once retired south to cover Buda, and the two armies met at S. Gothard on the Raab, where Achmet and his army proved themselves no match for the talents of his opponent or the wild valour of the French cavalry. Leopold, however, saw only in this great victory the opportunity of making peace, and of ridding himself of any further obligations to France. [Sidenote: =Treaty of Vasvar, 1664.=] Ten days after the battle of S. Gothard he signed the treaty of Vasvar (10th August 1664), by which he recognised the suzerainty of the Sultan over Transylvania, and permitted him to retain the important fortress of Neuhäusel in Hungary. Elated with this success Achmet turned his attention to the war with Venice. He took personal charge of the siege operations before Candia, and in spite of all that European engineering skill could do, it soon became obvious that the end could not long be delayed. Morosini the heroic defender of the town made the capitulation the occasion of negotiating a general treaty. [Sidenote: =Capture of Candia, 1669.=] On the 17th September 1669 Crete passed into the hands of the Ottomans, and peace was restored between Venice and the Porte. It was the last conquest Islam has made from Christianity. [Sidenote: =Condition of Poland.=]