Battle of the Atlantic

• The German steamer Vogesen (4241t) is lost in the Kattegat on a mine in the minefield laid by the British submarine Seal on the 4th.
• The British steamer Brighton (5359t) sinks on a mine in the North Sea. The entire crew is rescued.
• The German steamer Brage (5954t) sinks on a mine near the Kiel Light Ship.

Diplomatic Relations

Italy promises to respect the neutrality of Greece and the Balkan countries if Britain and Italy went to war, provided the British do not try to establish bases there.

Norway

The Norwegians fight back in the Roeros-Stoeren sector of east central Norway.

Secret War

The Pope tells Princess Marie-José, wife of the Italian Crown Prince, that Germany is about to attack the Low Countries. She passes on this information to her brother, King Leopold.