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Germany challenges Naval supremacy in Europe
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Triple Alliance and Triple Entente established
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Gavrilo Princip and Black Hand plan to advance unification of Slavic people
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Franz Ferdinand assassinated
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Austria-Hungary declares war on 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
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Great Britain declares war on Germany
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Japan joins the Allies in the war
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British and French armies stop Germanes at the Marne River
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Ottoman Empire joins Central Powers in war
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Germans use poison gas against Allied forces
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Germans launch Battle of Verdun
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French launch Battle of Somme