 Serbian nationalists claim that in Communist historiography, Serbs were transformed into oppressors, the Chetniks of World War II branded as collaborationist as the Ustaše, and the massacres of Serbs were downplayed.The Battle of Kosovo on Vidovdan (Saint Vitus Day) in 1389 between Serbia and the Ottoman Empire holds important symbolism in Serbian nationalism.Symbols used to express Serbian ethnic nationalism include the Serbian cross, a number of mottos or slogans and the so-called three-finger salute.