During the Austro-Turkish war (1683–1699) years, relations between Muslims and Christians in European provinces of the Turkish Empire were greatly radicalized. As a result of Turkish oppression, destruction of monasteries and violence against the non-Muslim civilian population, Serbian Christians and their church leaders headed by Serbian Patriarch Arsenije III sided with Austrians in 1689 and again in 1737 under Serbian Patriarch Arsenije IV. In the following punitive campaigns, Turkish armies conducted many atrocities against local Christian populations in Serbian regions, resulting in Great Migrations of the Serbs.