Simultaneously , a multi-side civil war was waged between the Yugoslav communist Partisans , the Serbian royalist Chetniks , the Croatian fascist Ustashe and Home Guard , Serbian Volunteer Corps and State Guard , as well as Slovene Home Guard troops .

Soldiers from the army of the Kingdom of Serbs , Croats and Slovenes ( `` later '' Yugoslavia ) , under the command Control of Slovene officer Rudolf Maister , killed Killing between 9 and 13 civilians of German ethnic origin , wounding Bodily_harm a further 60 , during a protest in a city centre square .

Estimates of casualties differ Change between Slovene and Austrian sources .