On 21 December 1941, the Partisans created the First Proletarian Brigade (commanded by Koča Popović) and on 1 March 1942, Tito created the Second Proletarian Brigade.
21. december 1941 oprettede partisanerne den Første proletariske Brigade (under Koča Popović' kommando), og 1. marts 1942 oprettede Tito den Anden proletariske Brigade.