Western Front
Air defences finally told of Giant bomber, codenamed Bertie, after its eighth raid.
Five-engined Zeppelin Staaken ‘Gigant’ bomber:
https://i1.wp.com/ww2-weapons.com/w...XV-03.jpg?ssl=1
Eastern Front
Odessa supports the Ukraine against the Bolsheviks.
Southern Front
First Battle of the Piave (until December 30): Brisk fighting in Piave delta; Italian counter-attacks against Mts Rertica and Asolone fail to gain ground until fog and thick snow end operations on December 21.
German and Austro-Hungarian forces claim another 1000 Italian prisoners captured. Italian soldiers riding on the front of a train while retreating from Austro-Hungarian and German attacks: © IWM (Q 114386):
https://twitter.com/CenturyAgoToday...801778017554433
British guns heavily engaged at Montello.
Naval and Overseas Operations
Channel: New Dover Straits minefield claims first victim, coastal submarine
UB-56 after Vice-Admiral Bacon advised to start flare and searchlight surface patrol along it.
Adriatic: 2 old Austrian battleships, 1 cruiser, 6 destroyers shell Italian Cortellazzo batteries again, but big ships withdrawn to Pola on December 20, 3 old battleships mothballed after December 28 to obtain personnel.
Political, etc
Canada: Conscription Law becomes effective.
The first ever NHL game is played between the Toronto Hockey Club against the Montreal Wanderers, with the Wanderers winning 10-9.
United States: U.S. Congress proposes a Constitutional Amendment which institutes alcohol prohibition to be ratified by the states. House of Representatives voted 282 to 128, Senate voted 47 to 8.