During that time, two major events tragically impacted Orthodox Church in the region. In the time of Austro-Turkish war (1683–1699) relations between Muslims and Christians in European provinces of Ottoman Empire were radicalized. As a result of Turkish oppression, destruction of Churches and Monasteries and violence against 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 forces conducted systematic atrocities against Christian population in Serbian regions, mainly in Metohija, Kosovo and Raška, resulting in Great Migrations of the Serbs.