By October 1862 Emperor Tewodros's position as ruler had become precarious: much of Ethiopia was in revolt against him, except for a small area stretching from Lake Tana east to his fortress at Magdala. He was engaged in constant military campaigns against a wide array of rebels. Likewise, Abyssinia was also threatened by the encroachment of Islam: Ottoman Turks and Egyptians repeatedly invaded Ethiopia from the Red Sea and from Sudan, while the Muslim Oromo tribe was expanding throughout Central Ethiopia. In a final attempt to recover his standing, Tewodros wrote to the major powers for help. As Donald Crummey recounts, "Now came the definitive attempt, at the turning point of the Emperor's career. Success might stabilize the internal situation; defeat would pull out the last prop. He proposed to send embassies with the ultimate objective of obtaining military alliances and agreements for technical progress."