Finland. Mannerheim Line starts to crack in the Summa sector. Soviet troops take a bunker near the village of Karhula, north of Marjapellonmäki (Hill 38). Finns are unable to retake the position despite bringing up reserves. North of Lake Ladoga, Finnish troops surround Soviet JR 203 creating the 'regimental motti'.
German destroyers Z3, Z4 and Z16 lay 110 mines in The Shipwash, a busy sea lane in the North Sea east of Harwich, England. Mines laid near Liverpool by U-30 on Jan 6 claim another victim. British steamer SS Chagres (1500 tons Cameroonian bananas) sinks 10 miles from her destination (2 lives lost). 62 crew members are taken to Liverpool by anti-submarine trawler HMS Loch Montreith.
Germany. OKH Chief of Staff Halder tires of von Manstein’s criticism of Case Yellow, his invasion plan for France, Belgium and Holland. Halder promotes Manstein to command an army corps garrisoning Poland, well away from planning forthcoming campaigns.