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In the spring of 1915, the Allies undertook naval and land operations in the Dardanelles that were intended to knock the Ottoman Empire out of the war with one blow and to open the straits for the passage of supplies to Russia. Amphibious landings were carried out at Gallipoli, but British forces, vigorously opposed by forces commanded by Atatürk, were unable to expand their beachheads. The last units of the expeditionary force were evacuated by February 1916.

In Mesopotamia the Ottoman army defeated a British expeditionary force that had marched on Baghdad from a base established at Basra in 1915. The British mounted a new offensive in 1917, taking Baghdad and driving Ottoman forces out of Mesopotamia. In eastern Anatolia, Russian armies won a series of battles that carried their control west to Erzincan by July 1916, although Atatürk, who was then given command of the eastern front, led a counteroffensive that checked the Russian advance. Russia left the war after the Bolshevik Revolution in 1917. The new Russian government concluded the Treaty of Brest-Litovsk with the Central Powers in March 1918, under which the Ottoman Empire regained its eastern provinces.

Sharif Husayn ibn Ali, the sultan's regent in Mecca and the Hijaz region of western Arabia, launched the Arab Revolt in 1916. The British provided advisers, of whom T.E. Lawrence was to become the best known, as well as supplies. In October 1917, British forces in Egypt opened an offensive into Palestine; they took Jerusalem by December. After hard fighting, British and Arab forces entered Damascus in October 1918. Late in the campaign, Atatürk succeeded to command of Turkish forces in Syria and withdrew many units intact into Anatolia.

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