Sea War
First German Norway invasion ships sail.
Air War
Sunderland flying boat disperses formation of 6 Ju 88s attacking convoy in North Sea (one Ju 88 shot down; second makes crash-landing in Norway and crew are interned).
First Spitfire Mk I lost on home defense duties – while shooting down He 111 off Yorkshire coast.
Home Fronts
Britain – Government reshuffle: Admiral of the Fleet Lord Chatfield, Minister for Co-ordination of Defense, resigns. First Lord of the Admiralty, Mr Churchill, to head new committee of Service Ministers. Lord Woolton becomes Minister of Food. General Sir Hugh Elles appointed National ARP Controller.
Canada: Earl of Athlone appointed Government-General in succession to Lord Tweedsmuir (John Buchan).