The battle that marked the beginning of water-locked warfare during World War I is the Battle of Gallipoli, which took place from April 1915 to January 1916. The campaign, involving Allied forces primarily from Britain and France, aimed to secure a sea route to Russia and defeat the Ottoman Empire. It resulted in prolonged trench warfare and significant casualties on both sides. The campaign ultimately failed, symbolizing the challenges of amphibious operations and the difficulties of engaging in combat over strategic waterways. Gallipoli is noteworthy for its impact on military strategy and has become a significant part of Turkish national identity.