 By the end of February 1943, Đurišić's Chetniks were resisting Partisan attempts to move east from the Neretva river. After the Battle of Neretva, during which the Partisans forced a crossing of the river against faltering Chetnik opposition, Đurišić's detachment of about 2,000 fighters fell back to Kalinovik, where they were almost defeated by the Partisan 2nd Proletarian Division in late March. Falling back further towards the Drina river, Đurišić had assembled about 4,500 Bosnian and Montenegrin Chetniks around Foča by April but was in desperate need of supplies. Shortly after this, the Italians withdrew most of their troops from Foča and abandoned most of the Sandžak. For the rest of April 1943, Đurišić fought a holding action against the Partisans along the Drina river with his 3,000 remaining fighters.
