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Heir to the Austro-Hungarian throne, Archduke Franz Ferdinand is assassinated by Gavrillo Princip in Sarajevo, Bosnia.
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After the assassination of Archduke Franz Ferdinand, Austria-Hungary declares war on Bosnia.
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Austria-Hungary is constantly battering Serbia but keep getting repulsed.
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Germany declares war on Russia because if Russia had intervened with the Austro-Hungary and Serb war Germany would support Austria-Hungary.
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Germany declares war on France two days after declaring war on Russia because of the Schlieffen plan was conceived.
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When Belgium refused Germany passage through Germany attacked Belgium immediately.
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Britain declared war on Germany after they had attacked belgium which was one of britain's allies.
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The battle of the frontier was made up of five offensives which were launched by French Commander in chief Joseph Joffre and German Helmuth Von Moltke.
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Russia invaded eastern Prussia because Russia had promised France that they would attack Germany from the east in order to divert German resources and to relieve pressure from France.
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Japan had given Germany an ultimatum to remove all German naval ships from Japanese and Chinese waters.
