In 1941 the Second World War engulfed the Kingdom of Yugoslavia. The Axis powers invaded in early April, and the Yugoslav royal army disintegrated and capitulated in just two and a half weeks. Since the old Yugoslav anthem included references to king and kingdom, the anti-royalist Partisan resistance led by Josip Broz Tito and his Communist party decided to avoid it and opted for "Hey, Slavs" instead. The song was sung at both the first and second sessions of AVNOJ, the legislative body of the resistance, and it gradually became the "de facto" national anthem of Democratic Federal Yugoslavia (new Yugoslavia).