On this day:
- Germany Stukas bombed Rotterdam, killing 980 people and destroying some 20,000 buildings.
- Holland surrendered; the government moved to the UK.
- 45 RAF aircraft, Battles and Blenheims, from a force of 100 were lost while attacking German troops at Sedan.
- French forces failed to stop German tanks at Sedan, the Germans turning west to isolate the Allies in Belgium.