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In the battle of tannenberg, which listed from august 26 to 30, Russia suffered a crushing defeat losing almost an entire army. By the end of august, german troops had advanced deep into france and were threatening paris.

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The first use of trench warfare

glossary term (opens in a new window)

during World War I was in the First Battle of the Marne from September 6 to September 12, 1914. French and British troops stopped the German advance that had threatened to take over France.

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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 campaign began with a failed naval attack by British and French ships on the Dardanelles Straits in February-March 1915 and continued with a major land invasion of the Gallipoli Peninsula on April 25, involving British and French troops as well as divisions of the Australian and New Zealand Army Corps.

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The Battle of Jutland was a naval battle fought between Britain's Royal Navy Grand Fleet, under Admiral Sir John Jellicoe, and the Imperial German Navy's High Seas Fleet, under Vice-Admiral Reinhard Scheer, during the First World War.