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 . The conflict resulted in a near-total Partisan victory , after which the Chetniks were almost entirely incapacitated in the area west of the Drina river . The Partisans continued on , and later again escaped the Germans in the Battle of Sutjeska . In the meantime , the Allies stopped planning an invasion of the Balkans and finally rescinded their support for the Chetniks and instead supplied the Partisans . At the Teheran Conference of 1943 and the Yalta Conference of 1945 , Soviet leader Joseph Stalin and British Prime Minister Winston Churchill decided to split their influence in Yugoslavia in half
Yalta Conference
Yalta Conference
Chetniks