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Archduke of Austria and his wife Sophie are assassinated in Sarajevo by young Serb nationalist Gavrilo Princip at 10.45, the casus belli of WWI
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1st military use of poison gas (chlorine, by Germany) in WW I
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WWI: ANZAC forces withdraw from the Gallipoli Peninsula after Ottoman forces successfully defend access to Constantinople
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US President Woodrow Wilson asks Congress to declare war against Germany
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World War I: German fighter ace Baron Manfred von Richthofen "The Red Baron", shot down and killed over Vaux sur Somme in France, Canadian pilot Arthur Roy Brown credited with the kill
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National Socialist Party (Nazi) forms as German Farmers' Party
