High Quality Content by WIKIPEDIA articles! The Middle Eastern theatre of World War I was the scene of action between 2 November, 1914, and 29 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. Also participating on the Allied side were Arabs who participated in the Arab Revolt, and Armenian Resistance which eventually became the Armenian Corps of Democratic Republic of Armenia. This theatre encompassed the largest territory of all the theatres of the war. There were five main campaigns: the Sinai and Palestine Campaign, the Mesopotamian Campaign, the Caucasus Campaign, the Persian Campaign and the Gallipoli Campaign. There were the minor Arabia and Southern Arabia Campaign and Aden Campaign. Besides their regular forces, both sides used asymmetrical forces in the region.