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Germany invaded Belgium, and the United Kingdom declared war in response

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First Battle of the Marne September 6- September 12, 1914

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First Battle of the Marne September 6- September 12, 1914

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Gallipoli Campaign February 1915 - January 1916

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Gallipoli Campaign February 1915 - January 1916

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British and French troops led this operation against Turkey to relieve pressure on the Russians. It ended in victory for the Allies but with terrible casualties, especially for the United Kingdom.

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Eventually, the British managed to surround German ships and both sides retreated after a desperate torpedo attack from the Germans.

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The British used tanks successfully for the first time at the Battle of Cambrai on November 20, 1917. The terrain on this battlefield in northern France sloped downward, making tanks particularly effective at tearing through defenses.

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The Second Battle of the Marne  July 15 - July 18, 1918

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The Second Battle of the Marne  July 15 - July 18, 1918

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They aimed to split the French army so they could capture the French city of Reims. However, the French knew this attack was coming ahead of time.