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Archduke Ferdinand is assassinated by a Serbian national
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Austria-Hungary declares war on Serbia, effectively beginning the First World War
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Germany declares war on Russia. France and Belgium begin full mobilization
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Germany declares war on France, and invades neutral Belgium. Britain then sends an ultimatum, rejected by the Germans, to withdraw from Belgium.
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The first British troops land in France
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Great Britain and France declare war on Austria-Hungary. Serbia is invaded by Austria-Hungary.
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Japan declares war on Germany
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Austria invades Serbia
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Germany declares the waters surrounding British Isles to be a war zone in which ships can be sunk without warning
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Battle of St. Julien begins
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Secret agreement signed in London between Italian Government and the Entente for Italian co-operation in the war and declarations by which Italy adheres to the Pact of London
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Lusitania Sunk
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The British Army suffers the worst single-day death toll in its history as 18,800 soldiers are killed on the first day of the Battle of the Somme
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British hospital ship "Britannic" sunk by mine in Ægean Sea.
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Battle of Kut begins
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A mass protest by Russian civilians in Petrograd
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The United States of America declares war on Germany
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The first American troops land in France
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China declares war on Germany and Austria-Hungary
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The village of Passchendaele is captured by Canadian troops
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President Woodrow Wilson outlines an elaborate peace plan to the U.S. Congress containing Fourteen Points as the basis of its establishment.
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Narva (Estonia) occupied by German forces
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Armistice concluded between the Allied and Associated Powers and Germany
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German delegation signs the Treaty formally ending the war
