The Straits became especially important in the course of World War I (1914-1918) as a potential link between the Entente powers' Eastern and Western Fronts. Anglo-French naval forces failed to take control of the Dardanelles (February - March 1915), but in the secret Straits Agreement diplomacy of March-April 1915 the members of the Triple Entente agreed - in the event of victory in World War I - to cede Ottoman territory controlling and overlooking the Straits to the Russian Empire. Anglo-French troops then launched the Gallipoli campaign, an ultimately unsuccessful operation to take control of the Straits following amphibious landings on the Gallipoli Peninsula (April 1915 to January 1916). The revolutions in Petrograd in 1917 ultimately stalled Russia's own plans to seize the Straits.