Political map of South & Southwest Asia 30 October 1918 (Armistice of Mudros): The Allied successes in Syria (Sinai and Palestine Campaign) and Mesopotamia (Mesopotamian Campaign) had destroyed much of the Ottoman Empire's fighting power. Just as bad, their ally Bulgaria had fallen to an Allied invasion from Greece (Armistice of Salonica), directly threatening the Ottoman capital of Constantinople. With the Allies advancing on all fronts and Germany no longer able to help, the Ottomans were forced to sue for peace. At the Armistice of Mudros, they accepted the Allied occupation of the Turkish Straits (occupation of Constantinople) and the loss of much of their Empire.