East Prussia: Russians beaten at Soldau.
Poland: Russians retreat on Lowicz, 150,000 men near Lodz encircled on 3 sides by 250,000 Germans; Grand Duke Nicholas countermands retreat order. Indecisive fighting north of Cracow on a 16-mile front.
Patrol skirmishes at various points.
Serbia: Austrian Sixth Army attacks Serb Second Army at Choka.
Black Sea: 14-minutes action in fog between returning Russian bombardment squadron and Goeben and Breslau, 20 miles (ca. 32 km) off the Crimea. Goeben (1 hit, 12 sailors killed) and Russian flagship Evstafi damaged (4 hits, 28 casualties).
Norway: German auxiliary mine layer Berlin interned at Trondheim for duration of war.
Western Front: 1st Wing, Royal Flying Corps, formed at St Omer from Nos 2 and 3 Squadrons under Lieutenant-Colonel H M Trenchard, to operate with Indian Corps and IV Corps of BEF.
Arabia: Captain Shakespear leaves IEF’D’, reaches Kuwait on mission to Ibn Saud (joins him on December 31).
France: Government returns from Bordeaux to Paris (completed on December 10).