But the Serbs soon found out that alien populations fare little better under Christian rule, when they are not of the same confession as their rulers, than under Mohammedan. The Orthodox Serbs in Dalmatia suffered thenceforward from relentless persecution at the hands of the Roman Catholics. In Austria-Hungary too, and in that part of Serbia occupied by the Austrians after 1718, the Serbs discovered that the Austrians, when they had beaten the Turks largely by the help of Serbian levies, were very different from the Austrians who had encouraged the Serbs to settle in their country and form military colonies on their frontiers to protect them from Turkish invasion. The privileges promised them when their help had been necessary were disregarded as soon as their services could be dispensed with. Austrian rule soon became more oppressive than Turkish, and to the Serbs’ other woes was now added religious persecution. The result of all this was that a counter-emigration set in and the Serbs actually began to return to their old homes in Turkey. Another war between Austria-Hungary and Turkey broke out in 1737, in which the Austrians were unsuccessful. Prince Eugen no longer led them, and though the Serbs were again persuaded by their Patriarch, Arsen IV, to rise against the Turks, they only did so half-heartedly. By the Treaty of Belgrade, in 1739, Austria had to withdraw north of the Save and Danube, evacuating all northern Serbia in favour of the Turks. From this time onwards the lot of the Serbs, both in Austria-Hungary and in Turkey, went rapidly from bad to worse. The Turks, as the power of their empire declined, and in return for the numerous Serb revolts, had recourse to measures of severe repression; amongst others was that of the final abolition of the Patriarchate of Peé in 1766, whereupon the control of the Serbian Church in Turkey passed entirely into the hands of the Greek Patriarchate of Constantinople. The Austrian Government similarly, perceiving now for the first time the elements of danger which the resuscitation of the Serbian nationality would contain for the rule of the Hapsburgs, embarked on a systematic persecution of the Orthodox Serbs in southern Hungary and Slavonia. During the reign of Maria Theresa (1740-80), whose policy was to conciliate the Magyars, the military frontier zone was abolished, a series of repressive measures was passed against those Serbs who refused to become Roman Catholics, and the Serbian nationality was refused official recognition. The consequence of this persecution was a series of revolts which were all quelled with due severity, and finally the emigration of a hundred thousand Serbs to southern Russia, where they founded New Serbia in 1752-3.