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The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie in Sarajevo (the capital of the Austro-Hungarian province of Bosnia-Herzegovina) on 28 June 1914 eventually led to the outbreak of the First World War.
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The Austro-Hungarian Empire declares war on Russia.
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To blank check to punish serbia.
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The Austro-Hungarian ultimatum demanded that Serbia formally and publicly condemn the "dangerous propaganda" against Austria-Hungary, the ultimate aim of which, it claimed, is to "detach from the Monarchy territories belonging to it".
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Austria-Hungary viewed the irredentist movements of South Slavs, as promoted by Serbia, as a threat to the unity of its multi-national empire.
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Allied troops landed on the Gallipoli peninsula in Ottoman Turkey.
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the British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland.
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Italy resigned from the Triple Alliance and later declared war against Austria-Hungary at midnight on May 23.
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when the German army began pounding the forts and trenches with artillery fire. 1,200 guns smashed the French positions.
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was the largest sea battle of the First World War. It pitted 151 British warships against 99 German ships and was the first and only time the two battle fleets confronted each other.
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after a week-long artillery bombardment of the German lines. Advancing British troops found that the German defences had not been destroyed as expected and many units suffered very high casualties with little progress.
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would come to symbolize, more than that of any other battle, the bloody nature of trench warfare on the Western Front.
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the lethal threat of the German U-boat submarine raises its head again, as Germany returns to the policy of unrestricted submarine warfare it had previously suspended in response to pressure from the United States and other neutral countries.
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Relations were reestablished in 1921 but were severed again in 1941 during World War II when Nazi Germany declared war on the United States.
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The Treaty of Versailles was signed at the Palace of Versailles outside Paris, France.