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Atlantic
- The cruisers Arethusa and Galatea, 6 British destroyers and a Polish destroyer give covering fire to the small British garrison besieged in the Calais Citadel. The destroyer Wessex is bombed and sunk. During the night German aircraft drop mines off the English south coast.
- The Polish submarine Orzel is lost in mining off the southwest coast of Norway.
- The British steamer Spinel (680t) is sunk by German bombing at Dunkirk. Her crew of 9 are rescued.
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]Battle of the Atlantic
- The Swedish steamers Dahlia (1078t), Lygia (1480t) and Brita (1345t) are seized by German forces at Bergen. All are renamed for German service: Dahlia to Johannes Willi; Lygia to Malmedy; Brita to Desiderius Siedler.
- The British minesweeping trawler Charles Boyes sinks on a mine off the east coast of England with the loss of 15 crewmen.
- The Panamanian tanker Joseph Seep (7088t) sinks on a mine off Le Havre Roads. The entire crew is towed to safety in a lifeboat from the Norwegian steamer Lystaad.
| ]Britain, Home Front
Munitions factories are now working round the clock.
[ | ]Secret War
Highly secret documents are discovered in a captured German staff car. The documents reveal a German plan to attack the gap between Menin and Ypres with 2 corps.
[ | ]Western Front
The Belgian front is breached between Geluwe and the Lys valley. The Belgian forces are driven out of Menin by attacks of units from Army Group B. The BEF despatch 2 divs to block the gap between Menin and Ypres. The last pockets of resistance in Boulogne are eliminated. 5,000 British and French troops are captured. The Allies fall back on Dunkirk. The British garrison repels an assault on the Calais Citadel and rejects a call to surrender. The French recapture part of Amiens.
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