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Archduke Franz Ferdinand is assassinated.
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Austria-Hungary declares war on Serbia, blaming them for the Archduke's death.
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Germany declares war on Russia and France.
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Britain declares war on Germany
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Russia, and soon the rest of the Allies, declare war on Turkey.
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Germans begin raiding Britain with airships.
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The Lusitania arrives in Liverpool, Britain. It became publicly known after that a American flag waved above it.
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At the Battle of Ypres, a German gas grenade was used. This would be a later fixture of the war.
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German U-boats sink Lusitania, claiming it was shipping goods to Britain.
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The Allied Autumn Offensive, one of the largest campaigns of the war, begins.
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The Battle of Verdun begins, which was believed to be one of the deadliest battles of the war.
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The Battles of Somme begin, believed to be some of the longest battles of the war.
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The Romanian government declares war on Austria-Hungary and begins mobilizing.
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The Greek Provisional Government declares war on Germany and Bulgaria
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The Germans retreat to the Hindenburg Line. This is a focal point of the war.
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America joins the Great War by declaring war on Germany.
