Volhynian Bloody Sunday

On Sunday July 11, 1943, the OUN-UPA death squads aided by the local Ukrainian peasants simultaneously attacked at least 99 Polish settlements within the Wołyń Voivodeship of the prewar Second Polish Republic under the German occupation. It was a well-orchestrated attack on people gathered for a Sunday mass at Catholic churches. The towns affected included Kisielin (Kisielin massacre), Poryck (Poryck Massacre), Chrynów (Chrynów massacre), Zabłoćce, Krymn, with dozens of other towns attacked at different dates with tens of churches and chapels burned to the ground. The Volhynian massacres spread over four prewar voivodeships including Wołyń with 40,000- 60,000 victims, as well as Lwów, Stanisławów and Tarnopol in Lesser Poland with 30,000- 40,000 Poles murdered for the total of 100,000 Polish victims of UPA terror. The Bloody Sunday of July 11, 1943 is not to be confused with the Stanisławów Ghetto Bloody Sunday massacre of 10,000 to 12,000 Polish Jews on October 12, 1941, before the Stanisławów Ghetto announcement.<ref name="Eisen/Stark"></ref>
Selected locations of the Volhynian Bloody Sunday massacres.
Below is the list of selected locations of the OUN-UPA mass killing raids targeting Polish Catholics, with the confirmed number of victims from July 11, 1943 exceeding one dozen men, women and children, according to compendium of Massacres of Poles in Volhynia and Eastern Galicia written by Władysław Siemaszko and Ewa Siemaszko. Existing settlements which have been attacked, but whose number of Polish victims remained undetermined at the time when the information was collected, are not listed here.