East Atlantic: Raider Möwe sinks 8 British ships (until January 20), including 3 on 13, totalling 27,888t almost matching January U-boat sinkings (5 British ships).
Somme: Lieutenant-General Earl of Cavan in command of new BEF XIV Corps of 3 divisions (until March 10, 1918).
Greece: French marines occupy Corfu, despite Greek protests, as base to refit Serb Army.
Montenegro: Austrians take Cetinje, but 3-day battle at Mojkovac 50 miles to north before General Vesovic orders his troops home.
Eastern France: German munitions dump explosion near railway station at Lille (night January 11-12) kills 108 civilians.