The French government is informed that Britain will go ahead with Operation Wilfred (mining the coast of Norway) without Operation Royal Marine (mining the River Rhine). Even Chamberlain believes the Allies have seized the initiative, crowing that “Hitler missed the bus” – words that he will come to regret. Allies deliver diplomatic notes (“admonitions”) to Norway and Sweden warning of actions to hinder German trade with these countries. Norwegians are now convinced of an Allied invasion and forget about Germany.
At 6.30 PM, British battlecruiser HMS Renown, destroyers HMS Inglefield, Ilex, Imogen, Isis, Greyhound, Glowworm, Hyperion, Hero & minelayer HMS Teviotbank depart Scapa Flow to mine the Norwegian coast.
Norwegian ambassador in Berlin warns of German plans to invade Denmark and parts of Southern Norway. The British also receive intelligence reports that Germany will soon invade Norway, including landings at Narvik. These warnings are ignored.
British submarine HMS Spearfish leaves Blyth for the Danish coast. http://www.youtube.com/watch?v=GCiBP8f5xVo