Peasants into Perpetrators: The OUN-UPA and the Ethnic Cleansing of Volhynia, 1943–1944, su cambridge.org.
«The OUN-UPA-planned ethnic cleansing continued unabated throughout summer 1943. The crescendo came on the night of July 11–12, 1943 when the UPA planned a highly coordinated attack (known among Poles as the 'Peter and Paul action' for the holiday on which it occurred) against Polish villages in three raions: Kovel', Khorokhiv, and Volodymyr-Volyns'kyi. Over one hundred localities were targeted in this action, and some 4,000 Poles were murdered. Finally, the last wave of attacks came in December 1943 before Shukhevych decided to move the cleansing operations to Galicia where tens of thousands more Galician Poles were murdered. Following the killings in Volhynia, the UPA-North group gave the order to 'destroy all traces of the Poles' by 'destroying all Polish churches and all other Polish places of worship'»
