Western Front
Battle of Verdun: "First Offensive Battle of Verdun” ends (see October 24th, 1916 and August 20th, 1917). Fourth (French 126th Division) Zouaves recapture Les Chambrettes Farm, a fairly irrelevant success.
The standard Allied claim is: Battle of Verdun ends in a French victory. France suffered 315,000-542,000 casualties, Germans suffered 281,000-434,000 casualties. Which estimates are highly doubtful on the German side. Mangin thanks his XI Corps ‘We have the method and we have the leader [Nivelle] It gives us the certainty of success’.

Eastern Front
Romania: Surviving elements of the Romanian Army begins reorganization in order to defend the Siret (AKA Sereth) River from Central Power attacks. Mud slows German pursuit; Falkenhayn checked 30 miles west of Braila, but Braila and Galatz still threatened.
Dobruja: RNAS armored car unit leaves Tulcea by barge for transfer to Braila (8 cars arrive there on December 21).
Russian position between Kovel and Lutsk restored.

Asiatic and Egyptian Theaters
British move round Sanna-i-Yat and reach Tigris above Kut, severing Turkish lateral communications and commanding river upstream of Khadairi Bend.

Political, etc.
United Kingdom: British government announces plans that it will end game preserves, as an effort to mitigate social class divisions.
Canada: Canada begins transferring 1000 miles of its own rails to France in order to facilitate movement of troops and supplies.
Italy: Italian Chamber declares solidarity with Allies.
United States: President Wilson issues Circular Note suggesting negotiations for peace (see 26th); note asks national objectives.
General Hugh L. Scott testifies to Congress that the U.S. will require 3 million trained soldiers to adequately defend the U.S.

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On the kinkometer, my kink measures as a sine wave.