(I said I would catch up on the day-to-day events, and here it is three months later.)

April 10-14th, 1940
Northern Front, Norway
Anglo-French troops are landed at Narvik near Trondheim but are unable to do more than hold some of their landing areas.

Atlantic Sea War
U-49, commanded by Kapitanleutnant Johann Egbert von Gossler, is sunk by HMS Brazen and HMS Fearless. Secret documents, probably connected with the German "Enigma" cyphering machine, float to the surface and are then captured by the British.

Sea War, Norway
Five British destroyers launch a surprise attack on 10 German destroyers to the west of Narvik. Each side loses two, while eight German merchant vessels and an ammunition carrier are also sunk.