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Austria-Hungary declares war on Serbia.
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This is when the very first battle of Marne began, and Trench warfare begins.
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They both declare war to Ottoman Empire.
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German Army starts the era of chemical warfare and use chlorine gas as a weapon.
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Nearly 1,200 people died in this tragedy.
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French and the German army suffered more than 700,000 people injured and about 300,000 of them killed.
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This day was marked to be one of the first "bloodiest" day in a first battle. Around 20,000 soldiers died on this day.
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This is when they come to an agreement to stop fighting for a certain time.
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The Treaty of Versailles is signed by Germany and the Allied & associated powers and come to an agreement of peace and no more battles.