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Assassination of Archduke Francis Ferdinand and his wife
It takes place in Saravejo, in the possession of the nationalist Gavrilo Princip -
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Austria-Hungary declares war on Serbia
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Russia moves troops south in support of Serbia
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Germany declares war on Russia
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Germany declares war on France
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Germany invades Belgium; the United Kingdom declares war on Germany
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Austria-Hungary declares war on Russia
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Japan declares war on Germany
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The Battle of the Marne begins, halting the German advance into France
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The Allies defend the city of Ypres in Belgium against the German army
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Germany uses poison gas for the first time at the Second Battle or Ypres
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The Gallipoli Campaign begins (France, the United Kingdom, and ANZAC forces against the Ottoman Empire)
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The British ocean liner RMS Lusitania is sunk by a German U- boat, killing 1,198 people, including 128 Americans
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Italy declares war on Austria-Hungary
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The Battle of Verdun, one of the longest and bloodiest battles of the war, between Germany and France
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The Gallipoli Campaign ends with the evacuation of Allied forces
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The Battle of the Somme, resulting in over 1 million casualties between the Allied and German forces
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The Russian Revolution begins, overthrowing the Tsarist regime of Nicholas II and leading to the establishment of a provisional government
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The United States declares war on Germany
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The Battle of Arras
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The Battle of Jutland, the largest naval battle of the war, between the British and German fleets
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The Bolshevik Revolution in Russia sees the Bolsheviks take power
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British forces capture Jerusalem from the Ottoman Empire
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The German Spring Offensive, a final German push to win the war before the arrival of American reinforcements
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The start of the Hundred Days Offensive, a series of Allied breakthroughs that push the Germans back
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Germany signs the armistice with the Allies in Compiègne, ending the war
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The TReaty of Versailles is signed, imposing harsh terms on Germany and formally ending the state of war