The Middle Eastern theatre of World War I was the scene of action between 29 October 1914, and 30 October 1918. The combatants were the Ottoman Empire, with some assistance from the other Central Powers, and primarily the British and the Russians among the Allies of World War I. There were five main campaigns: the Sinai and Palestine Campaign, the Mesopotamian Campaign, the Caucasus Campaign, the Persian Campaign, and the Gallipoli Campaign.