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Serbia and Russia battle over land specifically Scutari
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Germany effectively takes control of what remains of the Ottoman Empire in a 2 month campaign angers Russia
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While visiting Bosnia Archduke Franz Ferdinand of Austria is killed along with his wife he was the heir to the throne. Austria believes Serbian nationalists are at fault
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Angered Austria-Hungary (backed by Germany) delivers an ultimatum to Serbia who agree to talks but also mobilize their armies
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Austria-Hungary stop trying for peace talks and mobilizes their armies as well
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Not wanting full scale escalation Britain tries to get all European powers to meet for peace talks Germany says no
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Austria-Hungary declares war on Serbia
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Russia tells Germany to calm down but starts calling up troops Germany not to be outdone does the same
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Austria bombs the capital of Serbia (Belgrade)
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Tired of just posturing up Germany declares war on Russia
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Germany declares war on France and promptly invade Belgium (who was neutral because of previous treaty)
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Britain sticking up for Belgium demands Germany leave when they don't Britain declares war on Germany (the whole British Empire effectively declares war as well)