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While on a military inspection tour to the Bosnian capital Austrian Archduke Franz Ferdinand and his Morganatic wife Sophie, duchess of Hohenberg are shot dead by Bosnian Serb Gavrilo Princip under orders from Serbian colonel Dragutin Dimitrijevic emboldened by Serbia's recent success in the Balkan wars
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Austria's unacceptable ultimatum for Serbia is finished with intent to declare war on Serbia and uses its German allies to deter Russia
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Austria wanting for french president Raymond Poincaré to be returning from a state visit to Russia to deliver their ultimatum
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Serbia responds to Austria's ultimatum by accepting all but two of its demands, the dismissal of Serbian officials and their replacement by Austrian officials
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William II of Germany now back from a cruise tells Austria that war is no longer necessary as Serbia has agreed to almost all demands not knowing that a German foreign officer had encouraged Austria to go to war, Despite William's attempts war is declared by Austria
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Austrian artillery begins to bombard Belgrade and Russia orders partial mobilization
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After Austria's responds to Russia partial mobilization by mobilizing on the Russian frontier Russia orders general mobilization
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Germany after lose hope that the conflict will remain localized to the Balkans, the offer a 24-hour ultimatum to Russia requiring them to demobilize, and a 18-hour ultimatum to France requiring the m to stay neutral in any conflict between Russia and Germany
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After France and Russia deny German demands to deescalate Germany orders general mobilization and declares war on Russia, France likewise orders general mobilization
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Germany moves troops into Luxembourg and demands free passage through Belgium as neutral area
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Germany declares war on France, and by invading Belgium during the night draws Great Britain (who were previously neutral wanting to fight neither for Russia, France, or Serbia) into the conflict
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Russia, France, and Great Britain promise not to make separate peace treaties with the central powers forming and alliance referred to as the allies or allied powers