1. Knock out the Ottoman Empire from the war: The Allies believed that by capturing Istanbul and controlling the Dardanelles, they could effectively neutralize the Ottoman Empire from the war, disrupting their supply lines and connections with their Central Powers allies.
2. Open a supply route to Russia: By securing the Dardanelles, the Allies hoped to establish a direct sea route to Russia, which was facing severe ammunition shortages. Supplying Russia through this route would bolster their military efforts and strengthen the Allied cause on the Eastern Front.
3. Relieve pressure on the Western Front: The Allies believed that by drawing Ottoman forces to the Gallipoli front, they could divert German resources away from the Western Front in Europe, where the fighting was particularly intense and stalemated.
The Gallipoli campaign, however, turned into a costly and protracted stalemate. Despite heavy fighting and several attempts to break through Ottoman defenses, the Allied forces were unable to achieve their objectives. The campaign resulted in significant casualties and losses for both sides and ultimately ended with the withdrawal of Allied troops in January 1916.