Flanders: Sir J French’s farewell to BEF, leaves France on December 21. Joffre laments his departure. HAIG ASSUMES COMMAND OF BEF at noon.
Cameroons: 1,100 soldiers of French Eastern Force slowly advances south of Lembe until December 28. Cunliffe takes Ditam and Linte. French South Force (c. 1,000 soldiers) forces passage of river Campo on December 20 and captures Ambam on December 31.
Baltic: Cruiser Bremen and destroyer V191 sunk by Russian mines off Windau (Courland).
Eastern Mediterranean: 2 French cruisers arrive off Syria and cruiser Foudre at Dedegach to blockade Turk and Bulgar coasts.
Germany: First French night bombing raid damages Metz rail station.
USA: President Wilson marries Mrs Edith B Galt in Washington.