Feisal meant to retire further yet, to the Wadi Yenbo border of the great Juheina tribe. With fresh levies from them he would march eastwards towards the Hejaz Railway behind Medina, at the moment when Abdulla was advancing by the lava-desert to attack Medina from the east. He hoped that Ali would go up simultaneously from Rabegh, while Zeid moved into Wadi Safra to engage the big Turkish force at Bir Abbas, and keep it out of the main battle. By this plan Medina would be threatened or attacked on all sides at once. Whatever the success of the attack, the concentration from three sides would at least break up the prepared Turkish push-outwards on the fourth, and give Rabegh and the southern Hejaz a breathing space to equip themselves for effective defence, or counterattack.