The Battle of Zelengora was the final battle between the Partisans and the Chetniks that was fought between 12 and 13 May 1945. At the time of the battle, World War II in Europe had already officially ended and Partisan units had reorganized into the Yugoslav Army. Chetnik forces attempted to reach Serbia from Bosnia, through Zelengora, Drina and Sandžak. The Partisans prevented their attempt by creating a "buffer zone" in the area around River Bosna-Kalinovik-Motajica-Travnik. The Partisans were ultimately victorious, inflicting heavy losses to the Chetniks, who were de facto destroyed as a movement.