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January 10
Allies state peace objectives in response to US President Woodrow Wilson’s December 1916 peace note
January 31
Germany announces unrestricted submarine warfare
February 1
Germany resumes unrestricted submarine warfare
February 3
US severs diplomatic ties with Germany
February 23 – April 5
German forces begin withdrawal to strong positions on the Hindenburg Line
February 24
Zimmermann Telegram is passed to the US by Britain, detailing alleged German proposal of an alliance with Mexico against the US
February 26
US President Woodrow Wilson requests permission from Congress to arm US merchantmen
March 1
Zimmermann Telegram published in US press
March 11
British capture Baghdad
March 12
US President Woodrow Wilson announces arming of US merchantmen by executive order after failing to win approval from Congress
March 15
Tsar Nicholas II abdicates as a consequence of Russian Revolution
March 20
US President Woodrow Wilson’s war cabinet votes unanimously in favour of declaring war on Germany
April 2
US President Woodrow Wilson delivers war address to Congress
April 6
US declares war on Germany
April 9-20
Nivelle Offensive (Second Battle of Aisne, Third Battle of Champagne) ends in French failure
April 16
Lenin arrives in Russia
April 29 – May 20
Mutiny breaks out among French army
May 12 – October 24
10th, 11th and 12th Battles of Isonzo fought, ending in Italian failure
May 28
Pershing leaves New York for France
June 7
British explode 19 large mines under the Messines Ridge
June 15
US Espionage Act passed
June 26
First US troops arrive in France, 1st Division
June 27
Greece enters the war on the side of the Allies
July 2
Pershing makes first request for army of 1,000,000 men
July 6
T.E. Lawrence and the Arabs capture Aquaba
July 11
Pershing revises army request figures upwards to 3,000,000
July 16
Third Battles of Ypres (Passchendaele) begins
July 31
Major British offensive launched at Ypres.
September 1
Germany takes the northernmost end of the Russian front in the Riga offensive
October 24
Austria-Germany breakthrough at Caporetto on Italian front
November 7
Bolshevik Revolution in Russia results in Communist government under Lenin taking office
November 20
British launch surprise tank attack at Cambrai
December 7
US declares war on Austria-Hungary
December 9
Jerusalem falls to Britain
December 22
Russia opens separate peace negotiations with Germany (Brest-Litovsk)