Battle of the Atlantic
- The Swedish steamer Mars (1877t) sinks 1 mile east of St Marys Light Vessel on a mine laid by U-22 on the 15th. 7 of the crew are lost and 15 are rescued.
- The British tug Napia (155t) sinks on a mine off Ramsgate with the loss of her entire crew of 8.
- The Swedish steamer Vega (1300t) is badly damaged on a mine off the Dutch coast. She runs aground at Westergronden on the 21st. 17 survivors are picked up by the Swedish steamer Venern.
- The Swedish steamer Adolf Bratt (1323t) sinks on a mine in the North Sea with the loss of 5 crewmen. 16 survivors are rescued by the Latvian steamer Auseklis.
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]Finland - Winter War
Day 21
On the Karelian Isthmus the Soviet troops continue their attack at Summa. The offensive runs out of steam. By evening the Finns retain control of the main defensive positions. The Finnish II Army Corps under Lt-Gen Öhquist is ordered to counterattack. In northern Finland in the Salla sector a Russian battalion infiltrates the Finnish positions at Mäntyvaara. The Russian force is destroyed in hand-to-hand combat. The Soviet 122nd Div is cut off by Finnish attacks while advancing toward Salla from positions near the White Sea.
Russian aircraft attack a train carrying evacuees at Jänisjärvi Station in the parish of Harlu. 16 civilians are killed. The Russians also bomb Kontiomäki, Sortavala and Matkaselkä.
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| ]United States, Policy
The US issues a ban to export technical data for the production of aviation fuel to belligerent countries.
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