 The first of these large anti-Partisan offensives was "Fall Weiss", also known as the Battle of Neretva.The Chetniks participated with a significant, 20,000-strong, force providing assistance to the German and Italian encirclement from the east (the far bank of the river Neretva).However, Tito's Partisans managed to break through the encirclement, cross the river, and engage the Chetniks.