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The assassination of Archduke Franz Ferdinand was one of the causes of the war between Austria-Hungary and Germany (World War 1)
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The very first battle in World War 1 was the Battle of Liége. The German forces invaded Belgium and besieged the city's forts.
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A German U-boat torpedoed the British passenger liner Lusitania in the Atlantic Ocean. Killing 1,195 people, including 128 Americans, shifting U.S. public opinion against Germany.
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John J. Brennan served in World War 1 in the Army's 102nd Engineer Train from 1917-1919
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The U.S. joined in on World War 1 because of the sinking of merchant and passenger ships by the Germans, and the Zimmerman telegram that said the Germans proposed a military alliance between Germany and Mexico against the United States.
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John J. Brennan enlisted in the military on July 24, 1917. John joined the army and was in Belgium and France, anticipating a "grand adventure".
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John Brennan starts drill and works hard day and night, July 25 to August 24, 1918.
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The signing of the Armistice was a ceasefire that ended the fighting on the Western Front on November 11, 1918.
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John J. Brennan was discharged from the war on April 4, 1919, because the war was over, and the military was trying to send all of the guys left in service home.
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The signing of the Treaty of Versailles came to be at the Paris Peace Conference that marked the end of World War 1. It was signed by Germany and the Allied Nations on June 28, 1919. The treaty was largely a compromise where France sought heavy reparations and security from Germany.