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The assassination of Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife Sophie, Duchess of Hohenberg, occurred on 28 June 1914 in Sarajevo when they were mortally wounded by Gavrilo Princip.
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July 31, 1914 - Reacting to the Austrian attack on Serbia, Russia begins full mobilization of its troops. Germany demands that it stop. August 1, 1914 - Germany declares war on Russia. France and Belgium begin full mobilization.
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Germans introduce poison gas. On April 22, 1915, German forces shock Allied soldiers along the western front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres, Belgium. ... At the outbreak of World War I, the Germans began actively to develop chemical weapons.
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On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.
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Germany declares war on Russia
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German declares war on France
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Moltke orders the schlieffen plan to proceed
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World War I Begins
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Autro-Hungrian troops invade Seriba
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British Exeditionary Force arrives in France.
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Battle of Mons begins
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French Army abandons Plan 17.
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A German submarine sinks the passenger liner Lusitania. The ship carries 1,198 people, 128 of them Americans.
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Germany Limits Submarines
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First Tanks
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Submarines Back
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Zimmerman Telegram
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Wilson for War. President Wilson outlines his case for war to Congress.
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U.S. Enters War. Congress authorizes a declaration of war against Germany. The United States enters World War I on the side of France and Britain.
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Selective Service Act. Congress passes the Selective Service Act authorizing the draft. Although criticized for destroying democracy at home while fitight for it aborad, President Wilson claims he sees option and sings the bill into law.
