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  Austria blames Serbia for the death of Franz Ferdinand and sent it an ultimatum
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  Austria declares war on Serbia and shelled its capital of Belgrade
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  The Russian army got ready to help Serbia defend itself against the Austria attack
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  Germany warned Russia not to get involved
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  Germany declares war on Russia. Germany then began to move its army towards France and Belgium.
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  The French army was put on a war footing, ready to fight the German invasion.
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  Germany declared war on France
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  Germany Invades Belgium
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  Britain orders Germany to withdraw from Belgium
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  Germany still occupies Belgium. Great Britain declares war on Germany.
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  The Blank Check The link above explains what the Blank Check is
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  Austria decleares war on Russia