Western Front
French ace Guynemer destroys 5 German aircraft (until January 26).
10 RNAS Sopwiths bomb Burbach blast furnaces near Saarbrücken (one other raid February, repeated twice in March).

Eastern Front
Baltic Provinces: Battle of the Aa: German Eighth Army counter-offensive regains most ground lost between Lake Babit and Tirul Marsh (until January 25), taking 900 PoWs.
Romania: Battle of Pralea: In Romania, Bulgarian troops have crossed the Danube near Tulcea and have established a beachhead after driving away Allied troops. Another source directly contradicts, stating: Bulgarians driven back across Danube near Tulcea.

Naval and Overseas Operations
Allied London Naval Conference (until January 24) opened by Lloyd George who stresses its importance and appeals for unity. It agrees to withdraw 4 Royal Navy battleships from Mediterranean, Adriatic Squadron to use crews in smaller ships, likewise only HMS Lord Nelson and HMS Agamemnon to stay in Eastern Mediterranean; Anglo-French compromise on dispersed or fixed shipping routes in Mediterranean, to try both until next conference; British commander to be in command of Otranto Barrage under Italian C-in-C
North Sea: (Ah, here is the second destroyer action from yesterday): Harwich flotilla action with German 6th torpedo boat flotilla in the North Sea: H.M.S. Simoom sunk. Another source: A by Room 40 warned Harwich Force (3 cruisers and 14 destroyers) engages German 6th Torpedo Boat Flotilla (8 ships) and damages destroyers G41 and S5 in icy small hours bound for Zeebrugge. British destroyer Simoom sunk by S50 torpedo. German flotilla leader V69 driven damaged into Ymuiden (Holland) but not interned. And a third: German and British light flotillas clash twice in the North Sea. Britain loses a destroyer, while Germany loses a torpedo boat.

Political, etc.
United Kingdom: Britain rejects President Wilson’s attempts at mediating peace, stating there will be no “peace without victory.”
Labour Party approves acceptance of office by Labour Members in Ministry
Japan: Prime Minister of Japan states the country will resist any peace proposal that would reduce its armaments.
Japanese Foreign Minister promises that Japan will stop meddling in the affairs of China.

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On the kinkometer, my kink measures as a sine wave.