Key Facts
- Date
- January 20 – mid-to-late March 1943
- Also known as
- Fourth Enemy Offensive; Battle for the Wounded
- Key crossing
- Neretva River, mid-March 1943
- Axis operation name
- Unternehmen Weiß (Operation Weiss)
- Theater
- Occupied Yugoslavia, World War II
Strategic Narrative Overview
To execute the breakout, Tito assembled the Main Operational Group, which fought through successive engagements against Axis and Chetnik forces across Herzegovina. The final and most critical phase unfolded along the Neretva River, where Partisans—encumbered by large numbers of wounded—forced a crossing in mid-March 1943. Other Partisan corps, including the 1st Croatian and 1st Bosnian, evaded Axis pressure and reclaimed much of their prior territory despite heavy losses.
01 / The Origins
In early 1943, Axis forces launched Operation Weiss (the Fourth Enemy Offensive) across occupied Yugoslavia with the aim of destroying the Yugoslav Partisan movement. The offensive represented one of the largest coordinated Axis efforts against the Partisans and forced Tito's Supreme Command to respond by reorganizing its forces and planning a breakout toward eastern Herzegovina, Sandžak, and Montenegro.
03 / The Outcome
By mid-to-late March 1943, the Partisan Main Operational Group had successfully crossed the Neretva, breaking the Axis encirclement and allowing the movement to survive intact. The operation, though costly, demonstrated the Partisans' resilience and operational flexibility, and their ability to preserve wounded fighters became a celebrated episode in Yugoslav wartime memory.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Josip Broz Tito.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.