Norway
Surrender of Norwegian forces in Trondheim area.
Western Front
Hitler postpones Gelb offensive from May 5 to May 6 (further postponements on May 4, 5, 7 and 8).
General Huntziger, commander French 2nd Army, orders demolition of anti-tank obstacles (built without his sanction !) on two main roads from Ardennes forest.
Secret War
Colonel Oster of the Abwehr tells Colonnel Sas, Dutch military attaché in Berlin, that Germany will attack Low Countries soon (probably May 8).