Historical
While the Dutch defensive line holds German infantry in the north and central areas of the country, 9th Panzer Division raced to Moerdijk bridges over the Diep estuary 10 miles South of Rotterdam, held by parachute troops since the morning of May 10, preventing Allied forces reinforcing Fortress Holland. The Dutch Crown Princess Juliana and Prince Bernhard leave for Harwich, England on HMS Codrington.
The Belgian army blew up all the bridges over the River Meuse within Belgium, but 3rd and 4th Panzer Divisions attacked through a gap between the Dyle and Meuse rivers in central Belgium. At Hannut, they meet General René Prioux’s two French armoured divisions. French Somua S35 and Hotchkiss H35, with superior firepower and armour, destroyed large numbers of German Panzer MkIs and MkIIs.
Five RAF Fairey Battles bombed the bridges over the Albert Canal in Belgium. All were shot down.
German tanks passed through the Ardennes forest and prepared to cross the River Meuse at Sedan, Monthermé and Dinant.
Game day 255. Neutral countries.
Until the Germans attacked (in the game) the neutral countries could take no action. The U.S. convoys sailing across the pacific continued their journeys. The outbound convoy reached Hawaii and the inbound convoy sailed from Hawaii.

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.