OPROP! ( in correct 1940-Danish; ) was a German airborne propaganda leaflet dropped over several Danish cities at the German invasion of Denmark on 9 April 1940. The leaflets were signed by the head of Operation Weserübung Süd, General Leonhard Kaupisch. The text, written in broken but understandable Danish mixed with Norwegian, justified the German invasion as fraternally protecting Danish and Norwegian neutrality against British aggression, denounced Winston Churchill as a warmonger, and exhorted the Danish populace not to resist the German presence while an arrangement with the Danish government was being negotiated.