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Gavrilo Princip fired two shots
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Gavrilo Princip is arrested
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Archduke and Archduchess visit Sarajevo
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Serbia agrees to two of the three terms of the ultimatum
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Austria-Hungary sends ultimatum to Serbia
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Austria-Hungary declares war on Serbia
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Russia mobilizes to defend Serbia
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Germany orders France and Russia to stop mobilizing
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Germany declares war on Russia
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Germany declares war on France
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Britain declares war on Germany
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Canada is automatically at war against Triple Alliance
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Germany begins the Schlieffen Plan and attacks France through neutral Belguim
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Germany invades Belgium