Croatia (NDH). During World War II, Udbina was part of NDH's territory. Local gendarmerie sergeant Drakulić gave 200 rifles to the local Serbs, which on 12 April 1941 began with an ethnic cleansing of Lika from Gračac to Gospić. On 13 July 1941, Catholic priest Father Mate Mugoša delivered a sermon to his parishioners in Udbina pledging allegiance to the Ustaše and calling for the extermination of Serb population in Croatia, which preceded massacres of Serbs. In 1942, Serbs burned two Catholic churches, Church of St. Nicholas and Church of St. Mark Graveyard. In December of the same year, the Croatian population was expelled from Udbina. In order to conceal ruins, Serbs after the war built a hotel on the site of the Church of St. Nicholas, and used stone from the Church of St. Mark Graveyard for building a sheep barn. In addition, Serbs also destroyed the Church of St. Augustin in Mutilić and the Catholic cemetery in Korija. During the war, many local Serbs were killed by Ustaše and local Croats by Chetniks and Yugoslav Partisans. The Orthodox Church of St. Nicholas (filial of the Church of the Holy Transfiguration of Mutilić) was also destroyed during World War II. Most Croats fled from Udbina after the massacre on the eve before the St. Lucy's Day. Croats fled through Trovro mountain all the way to Lovinac. After World War II, the new Yugoslav authority took away the houses and lands from the Croats and gave them to Serbs who comprised Udbina's majority, as confirmed by 1961–91 censuses, with smaller numbers of Croats and Muslims. It seems that there was a Franciscan monastery of St. John on the "Udbina hill". Yugoslav authorities erected a monument to the Yugoslav Partisans on the site without doing any archeological research or getting approval from the Institute for the Protection of Cultural Monuments. During the construction of the Partisan monument, remains of medieval edifices and human bones were found on the site. In SFR Yugoslavia, Udbina was part of the Korenica municipality. During the Croatian War of Independence, Udbina was under control of the Republic of Serbian Krajina. During that time, the remaining Croats from Krbava were forced to leave. The only remaining Croatian settlement on Krbava, Podlapač was saved from the Serb militias by the UNPROFOR's Czech battalion. The local airport was used as an airbase for offensive operations against Croatia and Bosnia