The revolt in western Arabia has taken over much of the Hejaz region. British aid is flowing in through coastal ports. Emir Faisal is now trying to turn his tribal host into something approximating to a modern army. He has recruited Arab officers captured as prisoners of war from the Turks to provide the nucleus of an officer corps for his army. Many of these are natives of Mesopotamia and had a prior involvement in secret Arab nationalist organisations.
The Turks retain one outpost in the Hejaz, the city of Medina. Fahreddin Pasha holds this for the Ottoman Empire and is determined not to abandon it. His garrison is too strong for the rebels to attack him there. While they have attacked the railroad to Medina, the rebels have not been able to completely sever Fahreddin’s supply lines.
Arab troops (Wikipedia)
The Medina railroad (Wikipedia)