During the Axis Invasion of Yugoslavia in April 1941, although he was not in the army, Pinki responded to the call from his party and joined the fighting, where he was captured.
Бошко вступил добровольцем в югославскую армию в апреле 1941 года, следуя призыву Коммунистической партии Югославии, однако попал в плен.