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In page Lake Naroch Offensive:

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Under the terms of the Chantilly Agreement of December 1915 Russia, France, Great Britain and Italy were committed to simultaneous attacks against the Central Powers in the summer of 1916. Russia felt the need to lend troops to fight in France and Salonika (against her own wishes), and to attack on the Eastern Front, in the hope of obtaining munitions from Britain and France.[1]