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Archduke Franz Ferdinand of Austria and his wife Sophie are shot to death by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo. The killings sparked a chain of events that led to the outbreak of World War I by early August
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declares war on Serbia
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repeatedly invades Serbia but is repeatedly repulsed
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Germany declares war on Russia
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declares war on france
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US President Woodrow Wilson declares policy of US neutrality
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begins
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invades East Prussia
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First Battle of Marne, halts German advance, resulting in stalemate and trench warfare
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Austro-German attack on western Poland
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First Battle of Ypres
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First German air raid on Britain
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Unofficial Christmas truce declared by soldiers along the Western Front