The Schutzkorps (Šuckor; lit. "Protection Corps") was an auxiliary volunteer militia established by Austro-Hungarian authorities in the newly annexed province of Bosnia and Herzegovina to track down Bosnian Serb opposition (members of the Chetniks and the Komiti), while its main victims were civilians. Officially, they were an auxiliary gendarmerie, while in reality, they conducted illegal and repressive activities. It predominantly drew recruits from members of the Bosniak population and it became infamous as a result of its heavy involvement in the persecution of the Serbs. They particularly targeted Serb populated areas of eastern Bosnia. The role of the Schutzkorps is a point of debate. Persecution of Serbs conducted by the Austro-Hungarian authorities was the "first incidence of active 'ethnic cleansing' in Bosnia and Herzegovina". Some Muslim leaders emphasized that it would be wrong to blame the whole Muslim population of Bosnia and Herzegovina for the misdeeds of the Schutzkorps, because some Muslims provided help to their Serb neighbors, while some Serbs hid from persecution by applying to the Schutzkorps. The Annexation crisis of 1908–09 erupted on 6 October 1908, when Austria-Hungary announced the annexation of Bosnia and Herzegovina. Many people of Bosnia and Herzegovina were dissatisfied with the events, particularly Serbs who remained in feudal obligations to their Muslim landlords. To prevent their uprising, Austria-Hungary undertook repressive measures against Serb population, conducted by Schutzkorps. Schutzkorps were organized in eleven battalions of volunteers. In Herzegovina, the Schutzkorps avoided taking overly harsh measures against Serb populations near the border of Montenegro to avoid provoking its reaction. Since Gacko and Nevesinje are not near the border, its Serb population was subjected to terror from the Schutzkorps. At the end of October 1908, Serbs of Gacko reported to the government in Sarajevo about the Schutzkorps' terror, but no action was taken to investigate their reports.