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Russia got defeated and lost almost an entire army. Germany invaded Belgium, and the United Kingdom declared war. By the end of August, German troops had advanced deep into France and were threatening Paris.

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The First Battle of Marne Sep 6-12, 1914

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The First Battle of Marne Sep 6-12, 1914

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French and British troops stopped the Germans. On September 10, 1914, the Germans began a retreat and dug trenches. Germany released 160 tons of chlorine gas. Over 5,000 French and Algerian troops were killed or injured within minute.

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Gallipoli Campaign, Feb 1915-January 1916

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Gallipoli Campaign, Feb 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. The United Kingdom lost more than 200,000 soldiers.

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German forces followed them, and the battle continued. 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. It featured two machine guns that fired downward as the plane flew low over trenches. Germany used many large formations of these aircraft during the Battle of Cambrai.