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The Ottoman Empire joins the Central Powers
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Germany implements the Schlieffen Plan and attacks France
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'Trench warfare' begins
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Assassination of the Archduke Franz Ferdinand in Sarajevo
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Japan adheres to the Triple Entente
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The Germans use toxic gases for the first time in Ypres
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Italy joins the Triple Entente (Treaty of London)
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Bulgaria enters the war with the Central Powers
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The Battle of Verdun begins
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Allied offensive at Somme
From July to October -
Germany begins the submarine war
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The united States enters the war
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Russia signs the armistice with the Central Powers
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Wilson pronounces the speech on the 'Fourteen Points'
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Russia signs the Treaty of Brest-Litvosk
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Allied counter-offensive on the Western front
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Germany signs the armistice. The war is over