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Archduke Franz Ferdinand was assassinated by a Serbian nationalist named Gavrilo Princip.
http://www.history.com/this-day-in-history/archduke-franz-ferdinand-assassinated -
Exactly one month after Archduke Franz Ferdinand was assassinated, Austria-Hungary declared war on Serbia which started the beginning of WWI.
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The battle was fought between Russia and Germany in the first month of WWI. The battle finished in entire destruction of the Russian Army and suicide of their commanding general, Alexander Samsonov.
http://www.history.com/this-day-in-history/battle-of-tannenberg-begins -
The first battle of Marne began. Trench warfare began as soldiers on both sides started fighting.
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Allied and German forces began the first battle to control the city and its advantageous positions on the north coast of Belgium.
http://www.history.com/this-day-in-history/first-battle-of-ypres -
Kaiser Wilhelm announced an important step in the development of that policy, proclaiming the North Sea a war zone.
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During this battle, the Germans used poison gas for the first time ever.
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An unsuccessful attempt by the Allied Powers to control the sea route from Europe to Russia.
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This battle came about because of German General Erich von Falkenhayn. This battle was the longest battle of WWI and one of the bloodiest.
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It involved 250 ships and 100,000 men, the battle was off Denmark's North Sea coast and was the only major naval battle of the war.
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It was one of the largest battles, tanks were finally introduced into the battle.
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It was the third battle of Ypres.
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Russia signed Treaty of Brest Litovsk. It was a peace treaty between Russia and the Central Powers.
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It was near the Marne River, and the Germans began the final offensive push of WWI. The conflict ended shortly in a major victory for the Allies.
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Germany agreed to pay reparations under the Dawes Plan and the Young Plan.
https://www.britannica.com/event/Dawes-Plan