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Archduke Francis Ferdinand is assassinated.
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Austria-Hungary declares war on Serbia, beginning World War I. -
Germany invades Luxembourg and Belgium. France invades Alsace. British forces arrive in France. Nations allied against Germany were eventually to include Great Britain, Russia, Italy, Australia, New Zealand, South Africa, Rhodesia, Romania, Greece, France, Belgium, United States, Canada, Serbia, India, Portugal, Montenegro, and Poland. -
Austria-Hungary invades Russia. -
Allied forces halt German advance into France during First Battle of the Marne. -
Germany begins naval blockade of Great Britain. -
Allied forces land on the Gallipoli Peninsula of the Ottoman Empire.