Finland
Winter War – Second battle of Summa: Russian 7th Army batters key sector of Mannerheim Line near village of Summa, with waves of tanks pulling armored infantry sledges (‘Molotov Coffins’) and flamethrowers; supported by ‘creeping’ artillery barrage and hundreds of aircraft. Finns repel all attacks until February 11 (but battle ends on February, 16).
Home Fronts
Britain: Admiralty takes control of merchant ship building and repairing.
Japan: Government begins five-year re-armament programme.