World War II: Mostar is liberated by Yugoslav partisans

Mostar is a city and the administrative centre of Herzegovina-Neretva Canton of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina, and the historical capital of Herzegovina.

Yugoslavs or Yugoslavians is an identity that was originally conceived to refer to a united South Slavic people. It has been used in two connotations: the first in a sense of common shared ethnic descent, i.e. panethnic or supraethnic connotation for ethnic South Slavs, and the second as a term for all citizens of former Yugoslavia regardless of ethnicity. Cultural and political advocates of Yugoslav identity have historically purported the identity to be applicable to all people of South Slav heritage, including those of modern Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia, Serbia, and Slovenia. Although Bulgarians are a South Slavic group as well, attempts at uniting Bulgaria with Yugoslavia were unsuccessful, and therefore Bulgarians were not included in the panethnic identification. Since the dissolution of Yugoslavia and establishment of South Slavic nation states, the term ethnic Yugoslavs has been used to refer to those who exclusively view themselves as Yugoslavs with no other ethnic self-identification, many of these being of mixed ancestry.

The Yugoslav Partisans, officially the National Liberation Army and Partisan Detachments of Yugoslavia was the communist-led anti-fascist resistance to the Axis powers in occupied Yugoslavia during World War II. Led by Josip Broz Tito, the Partisans are considered to be Europe's most effective anti-Axis resistance movement during World War II.