These posters blame Croatia – and totally defraud the role of the Serbs.
“On 4 August, Croatia started Operation Storm, with the aim of recapturing almost all of the occupied territory in Croatia, except for a comparatively small strip of land, located along the Danube, at a considerable distance from the bulk of the contested land. The offensive, involving 100,000 Croatian soldiers, was the largest single land battle fought in Europe since World War II. Operation Storm achieved its goals and was declared completed on 8 August.” Source Wikipedia
Read the entire 45 (!) Wikipedia pages to get the complete picture!