 He joined the Communist Youth (SKOJ) during his gymnasium years in Sarajevo.The Partisan and Chetnik forces captured Rogatica on 24 October 1941, during the Siege of Rogatica.The final assault of the Partisan forces was carried out under the direct command of Partisan HQ member Seljo, including a detachment commanded by Slaviša Vajner "Čiča", when Partisans used Molotov cocktails to attack the town garrison.