The Italians incurred 30,531 casualties during their occupation of Yugoslavia . The ratio of dead/missing men to wounded men was uncommonly high, as Yugoslav partisans would often murder prisoners. Their highest losses were in Bosnia and Herzegovina: 12,394. In Croatia the total was 10,472 and in Montenegro 4,999. Dalmatia was less bellicose: 1,773. The quietest area was Slovenia, where the Italians incurred 893 casualties. An additional 10,090 Italians died post-armistice, either killed during Operation Achse or after joining Yugoslav partisans.. How many more Italian casulties occured during the occupation of Yugoslavia than died during Operation Achse or after joining Yugoslav partisans?