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Francis Ferdinand is assassinated
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Austria-Hungry declared war on Serbia
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ussia mobilizes in preparation to protect Serbia
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France and Germany moblize. France as Russia's ally and Germany as Austria-Hungrary's ally.
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Austria-Hungary declares was on Serbia.
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Germany declared war on Russia
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Germany declares War on Russia. France and Belgium begin full mobilization.
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Germany declare sWar on France, and invades neutral Belgium. Britian then sends an ultimatum, rejected by the Germans, to withdraw from Belgium.
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Germany invades neutral Belgium to reach France quickly. Great Britian came into the war because of Germany being neutral to Belgium. It became an international treaty.
