U-9 torpedoed the captured German steamer Sigurd Faulbaum while under tow by two Belgian tugboats, northeast of Zeebrugge.
2nd Panzer Division attacked Boulogne, triggering the evacuation of British 20th Guards Brigade which has just arrived. Several British and French destroyers were bombed until RAF fighters arrived. Germans firing from the land claimed several lives on the ships, including the captains of HMS Keith and HMS Vimy.
The British 3rd Royal Tank Regiment, equipped with cruiser tanks, and the 30th Motor Brigade landed at Calais to confront 1st Panzer Division.
General Lord Gort withdrew the British Expeditionary Force from Arras after the engagement yesterday.
The Battle of the Lys began in Flanders.
Oswald Mosley and Archibald Maule Ramsay were among a number of Britons arrested under Defence Regulation 18B, a law allowing for the internment of people suspected of being Nazi sympathisers.
The Treachery Act 1940 received Royal Assent in Britain.
Game day 266. Japan
Japan remained in a defensive mode in all the contacts with the Chinese along the border with China. Six armoured battalions, fresh from Japan, were rushed westwards from Shanghai.
Credits: Historical information: http://www.worldwar2daybyday.blogspot.com, Wikipedia, Chronicle of the Second World War (JL International Publications, 1994). Background image to game maps: Hasbro Ltd.