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june 28: Assassination of Archduke Franz Ferdinand

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Aug 2. Germany declares war on Russia

Aug 4. British declares war on Germany

Aug 6. The Austro-Hungarian Empire declares war on Russia.

Aug 10.Austria-Hungary invades Russia.

Aug 30. German possessions in the Far East are attacked as New Zealand troops occupy German Samoa.

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April 22.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

April 24.the battalion, subjected to a German gas attack near St. Julien, was nearly annihilated

April 25.Allied troops landed on the Gallipoli peninsula in Ottoman Turkey

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Oct. 12: British nurse Edith Cavell is executed by the German Army

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July 1 - Nov . 18: The Battle of the Somme

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July 28: On 28 July, Austria-Hungary declared war on Serbia. It was determined to take decisive action against Serbia and, by now, knew this risked war with Russia, Serbia's supporter.

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Sept. 10: the Germans began a general retreat that ended north of the Aisne River, where they dug in, and the trench warfare that was to typify the Western Front for the next three years began

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Nov. 22: The Allies suffered major casualties, with the French sustaining somewhere 50,000 to 80,000 casualties, followed by the British with over 58,000, and Belgium with over 21,000.

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Dec. 25: the western front and possibly other parts of the eastern front went quiet in observation of Christmas.

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May. 7: Sinking of the RMS Lusitania

May 23: On May 3, Italy resigned from the Triple Alliance and later declared war against Austria-Hungary at midnight on May 23.

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Feb.21-Dec.18: Battle of Verdun

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Nov. 7: Democratic U.S. President Woodrow Wilson narrowly defeated Republican Charles E. Hughes in the U.S. presidential election. Republican Jeannette Rankin of Montana became the first woman elected to the United States House of Representatives.