The 13th Waffen Mountain Division of the SS "Handschar" (1st Croatian) was a mountain infantry division of the Waffen-SS, an armed branch of the German Nazi Party that served alongside but was never formally part of the Wehrmacht during World War II. From March to December 1944, it fought a counter-insurgency campaign against communist-led Yugoslav Partisan resistance forces in the Independent State of Croatia, a fascist puppet state of Germany that encompassed almost all of modern-day Croatia, all of modern-day Bosnia and Herzegovina as well as parts of Serbia. It was given the title Handschar (Bosnian: Handžar) after a local fighting knife or sword carried by Ottoman policemen during the centuries that the region was part of the Ottoman Empire.