In January 1943 the German army, afraid of an Allied invasion of the Balkans, launched a great offensive against Yugoslav Partisans in Western Bosnia. The only way out for Partisan forces and thousands of refugees was the bridge on the river Neretva.

The headquarters of the Marshal Tito's Liberation Army are surrounded by Axis forces. The Partisans have no choice but to fight their way out of the encirclement and face the enemy on the plains of Sutjeska.

Treachery and escape from agents provocateurs of underground workers among the early days of national rising in Croatia.