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February 21 – December 18
German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides
March 11 – November 14
5th, 6th, 7th, 8th and 9th Battles of Isonzo between Italy and Austria-Hungary
April
British forces in Mesopotamia begin to advance on Baghdad
March 9
Pancho Villa’s raid on Columbus, New Mexico
March 24
French passenger ship, Sussex, torpedoed
April 24
Easter rebellion starts in Ireland
May 4
Germany renounces submarine policy
May 19
Britain and France conclude Sykes-Picot agreement
May 31 – June 1
Battle of Jutland, the biggest naval battle in history, ultimately without a clear victor
June – August
Turkish forces, led by Enver Pasha, are defeated by the Russians in the Caucasus
June 4 – September 20
Russian Brusilov offensive in Carpathia nearly knocks Austria-Hungary out of the war
June 5
With British support (led by T.E. Lawrence), Hussein, grand sherif of Mecca, lead an Arab revolt against the Turks in the Hejaz
July 1
Start of the Battle of the Somme, with the greatest number of casualties in British military history, 60,000
July 29
US marines land in Haiti
August – December
Romania enters the war with the Allies but is quickly overrun by German forces
August 28
Italy declares war on Germany
August 31
Germany suspends submarine assaults
September 15
Tanks were introduced for the first time on the Somme battlefield by the British
October 15
Germany resumes U-boat attacks
November 7-9
US President Woodrow Wilson secures re-election
November 18
End of the Battle of the Somme
November 28
First German airplane (as opposed to zeppelin) air-raid on Britain
November 29
US occupation of Santa Domingo proclaimed
December 7
David Lloyd George replaces Asquith as British Prime Minister
December 12
Germany issues peace note suggesting compromise peace
December 18
US President Woodrow Wilson requests statements of war objectives from warring nations in peace note