Eastern Front
Romania: Battle Of Bucharest: Fighting rages on three sides of Bucharest. Romanian troops recapture two villages to the south, but are pushed back in the north and west.
Heavy fighting at Cerna Voda (Dobruja).
Carpathians: In the Carpathians, Russian troops advance against Austria-Hungary and enter the village of Cârlibaba.
Southern Front
Greece: Allies declare blockade and embargo all Greek vessels. Venizelists fight Royalists in Athens (former massacred on December 6). Twohundred people are killed in Athens due to clashes between Entente and Greek troops. King Constantine of Greece agrees to a truce.
Serbs carry strong Bulgarian positions north of Gumishta; Turks assist Bulgarians at Seres and Drama.
Naval and Overseas Operations
East Africa: British Kilwa Force occupies Ngarambi, 30 miles northwest of Fort Kibata.
Political, etc.
Austria-Hungary: New Emperor Charles takes command of Armed Forces.
Russia: Russian Premier (M. Trepov) announces that the Allies have acknowledged Russia's right to Constantinople and the Bosphorus Straits (see March 12th and April 12th, 1915).
Duma attack on ‘dark forces’ behind throne.
United Kingdom: British news-film “Topical Budget” showing Serbian troops operating in Macedonia, among other news:
http://film.iwmcollections.org.uk/record/index/5406
Greece: As part of the truce, Greek Government agrees to surrender six (subsequently eight) field batteries.