Question: What was officially initiated by Sherif Hussein bin Ali at Mecca on 10 June 1916, and was part of the Siege of Medina that occurred during World War I?
Sentence (from "Siege of Medina"): Sharif Hussain of Mecca revolted against the caliph and the Ottoman Empire which, under the leadership of the nationalistic Young Turks, had ignored the wishes of the Caliph and sided with the Central Powers.
Relevant evidence: Yes