#Serbia #WWII 06. April 1941. the bombing of Belgrade and the German-led invasion, occupation and dismemberment of Yugoslavia by Adolf Hitler and the Axis powers. The National Library, with 300,000 manuscripts and books from the medieval period, was burned down. Over 1,300 Cyrillic manuscripts from the 12th through 18th centuries were destroyed. Belgrade was reduced to rubble with hundreds of buildings damaged or destroyed.