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Germany, Austria-Hungary and Italy form the "Triple Alliance" (month and day unknown)
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Period: to
Growth of armies everywhere in Europe cause tension within Europe (months and days unknown)
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Period: to
Crises in the Balkans (months and days unknown)
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Period: to
Russia suffers heavy losses (months and days unknown)
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Austria-Hungary declares war on Serbia. Partial mobilization (training of troops) of the Russian army against Austria-Hungary occurs
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Full mobilization of the Russian army against Austria-Hungary occurs. Germany warns Russia to halt the mobilization. Russia ignores Germany.
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Germany declares war on Russia
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Germany declares war on France. Germany demands the right to pass through Belgium but Belgium is neutral.
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Britian declares war on Germany for violating the Belgian neutrality
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The Allies (Russia, Britain and France) declare war on the Ottoman Empire (The Ottoman Empire had joined the Central powers) (Day unknown)
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Planes are used in war for the first time (month and day unknown)
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Italians turn on Germany and Austria by attacking Austria (Day unknown)
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The British ship Lusitania is sunk by the German blockade
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Bulgaria joins Germany and Austria and together, they defeat Serbia (Day unknown)
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There is a growing opposition within the citizens against the war and the war governments fight back against this opposition (month and day unknown)
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A poem "War Girls" is written in Britain mentioning the fact that during the war, women had jobs that they had never had before (month and day unknown)
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Trenches dug on the Western Front become more elaborate (month and day unknown)
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America joins the war (Month and day unknown)
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Russia completely loses the will to fight (month and day unknown)
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America joins the war (Month and day unknown)
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American troops begin to arrive in Europe in large numbers (month and day unknown)
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38% of Krupp Armaments workers in Germany are women, due to the lack of men in the war (month and day unknown)
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Britain defeats the Ottoman Empire (month and day unknown)
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World War I ends. The Allied powers win the war