Air War
Western Front: First RFC Sopwith Pup Squadron (No 54) arrives in France, now 38 active squadrons with 700 aircraft against 33 German JagdstafÂfeln (establishment 14 planes each). No day flying possible.
Western Front
Christmas.
Germany: Major Wetzel and OHL estimate that US expeditionary force on Western Front not possible before spring 1918.
Eastern Front
Russia: Tsar‘s Order to Army and Navy stresses no thought of Peace till ‘final victory’
Middle East
Armenia: Fighting round Lake Van, Turks driven south on December 28.
South Persia – Action of Dasht-i-Arjan: c.400 British & Persians troops forced back to Shiraz (until December 28).