Haapalah / Aliyah Bet

On June 5, 1916, Ali and Faisal, sons of Sharif Hussein, led an attack on the Ottoman garrison in Medina, but were defeated by Fakhri Pasha.
Around June 8, 1916, Grand Sharif Hussein, as the guardian of the holy city of Mecca, entered into an alliance with the United Kingdom and France against the Ottomans.
Evidence that the Ottoman government was planning to depose Sharif Hussein after the war led him to an exchange of letters with British High Commissioner, Henry McMahon, which convinced him that allying with the Triple Entente would be rewarded by an Arab empire encompassing all the territory from Egypt to Persia, with the exception for Kuwait, Aden, and the Syrian coast.
n June 10, 1916, Sharif Hussein ordered the attack on the Ottoman garrison in Mecca.
The Battle of Mecca, was a month of bloody street fighting between the better armed Ottoman troops and Sharif Hussein's tribesmen.
On June 10, 1916, Emir Abdullah attacked Ta'if, and was repulsed.

On July 9, 1916, the Hashemite forces in Mecca, supported by Egyptian troops sent by the British, who provided much needed artillery support, took Mecca.

On September 22, 1916, after a siege, the Emir Abdullah and his Hashemite troops, with Egyptian artillery support, took Ta'if.