Case Black or the Battle of the Sutjeska was a joint attack by the Axis taking p

Case Black or the Battle of the Sutjeska was a joint attack by the Axis taking place from 15 May to 16 June 1943, which aimed to destroy the main Yugoslav Partisan force, near the Sutjeska river in south-eastern Bosnia. The failure of the offensive marked a turning point for Yugoslavia during World War II.

The operation immediately followed Case White which had failed in accomplishing the same objectives: to eliminate the central Partisan formations and capture their commander, Marshal Josip Broz Tito.

The successful Partisan breakout helped their reputation as a viable fighting force with the local populace. The battle marked a turning point toward Partisan control of Yugoslavia, and became an integral part of the Yugoslav post-war mythology, celebrating the self-sacrifice, extreme suffering and moral firmness of the partisans.