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june 28: Archduke franz ferdinand of austria was assassinated in sarajevo , which triggered the start of world war l

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Aug. 2: .germany declared war on belgium
Aug, 4: germany invaded belgium , leading the UK to declare war on germany
Aug. 6: austria hungary declared war on russia
Aug. 10: france began its offensive against germany in the battle of the frontiers
Aug. 30 - the battle of tannenberg started , where german forces defeated the russians

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April 22 – May 25: the second battle of ypres began , marking the first large -mscale use of poison gas by germany

april 24 - the armenian genocide started , as ottoman forces began mass deportations and killings of armenians

april 25 - allied forces landed on the gallipoli peninsula , starting the gallipoli campaign

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oct 12 - the british launched a attack on the turkish forces at the battle of suvla bay during the gallipoli campaign

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July 1 – Nov. 18 - the battle of the somme took place , which was one of the largest battles of world war l

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july 28 - austria hungary declared war on serbia , marking the beginning of world war l

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nov 22 - the british launched an attack on the ottoman empire at the battle of ctesiphon during world war 1

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dec 25 - soldiers from both sides of the western front took part in an unofficial truce , celebrating christmas together

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may 7 - the RMS lusitania was sunk by a german U - boat , resulting in the deaths of 1,198 passengers and crew

may 23 - italy declared war on austria hungary , joining the allies in world war 1

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feb 21 - dec 18 : the german forces launched a major attack at verdun , marking the start of one of the longest battles in world war l

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nov 7 - the battle of the somme officially ended , having resulted in over one million casualties and significant territorial changes on the western front

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march 15 - tsar nicholas ll of russia adicated the throne during russian revolution

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July 31 – Nov. 10 - the third battle of ypres , also known as the battle of passchendaele , took place , marked by heavy fighting and significant casualties

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jan 8 - U.S president woodrow wilson delivered his fourteen points speech , outlining his vision for peace after world war l

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may 31 -the battle of lys began , where allied forces faced a major german offensive in france

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june 28 - the treaty of versailles was signed , officially ending world war l and placing heavy penalties on germany

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jan 19 - the british intercepted the zimmermann telegram , which revealed germany's proposal to mexico to join the war against the U.S

jan 31- germany announced the start of unrestricted submarine warfare

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april 6 - the united states declared war on germany officially joining world war lm

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nov 2 - the balfour declaration was issued , where britain expressed support for establishing a national home for the jewish people in palestine

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march 3 -russia signed the treaty of brest - litovsk with germany , ending their involvement in world war l

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Nov. 9: the german kaiser wilhelm ll abdicated
Nov. 10: the german government requested an armistice
Nov. 11 - world war l officially ended with the signing of the armistice at 11 a.m.

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aug 10 - the treaty of sevres was signed , which officially ended hostilities between the allies and the ottoman empire after world war l