Western Front
Many German raids on British lines.
A group of wounded veterans at a Red Cross Hospital in France:
https://twitter.com/CenturyAgoToday...278667191930880
69th regiment New York National Guard “The Fightin Irish” marching to the trenches at St. Clement, France:
https://twitter.com/CenturyAgoToday...595789944217602
Eastern Front
Ukraine: Kiev captured by German forces (see December 20th), and continued advance of Austrians.
Central Powers offensive against Soviet Russia reach the Dnieper river near the city of Rechytsa (Belarus).
Naval and Overseas Operations
German force landed in the Aaland islands at request of Finnish Government (see 3rd). *900 Jaegers transported from Danzig.
German troops landing on Aaland islands:
https://i0.wp.com/ww2-weapons.com/w...lands.jpg?ssl=1
British submarine HMS
H.5 is mistaken for a German U-boat and rammed by a British merchantman, killing all of the submarine’s crew.
Asiatic and Egyptian Theaters
Palestine: British (53rd Welsh Division) advance on 12-mile front astride Jerusalem-Nablus road.
Political, etc
Austria-Hungary: Prince Mirko of Montenegro, the 2nd son of Kinch Nicholas I of Montenegro, passed away while in Vienna:
https://twitter.com/CenturyAgoToday...535340204654592
Russia: Leon Trotsky orders old Russian Army‘s demobilization.
Romania: Romania agrees to negotiate for peace on basis of Central Powers’ demands.
United States: A U.S. Boy Scout wearing a gas mask:
https://twitter.com/CenturyAgoToday...293770914254848