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Archduke Francis Ferdinand is assassinated.
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Austria-Hungary declares war on Serbia, beginning World War I.
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Austria-Hungary invades Russia.
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Allied forces halt German advance into France during First Battle of the Marne.
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Allied forces land on the Gallipoli Peninsula of the Ottoman Empire.
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German submarine sinks the passenger liner Lusitania during crossing from New York to Liverpool, England, killing 128 Americans.
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Italy declares war on Austria-Hungary.
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Germany begins the attack on Verdun.
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Allied offensive begins the Battle of the Somme.
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Battle of Verdun ends
550,000 French and 450,000 German casualties. -
The United States declares war on Germany.
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Russia signs armistice with Germany.
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Russia signs the Treaty of Brest-Litovsk with Germany.
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Germany begins its final offensive of the war.
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Allied forces begin the attack at Meusse-Argonne, the final offensive of the war.
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End of War
Germany signs the Armistice at Compiègne, ending World War I.