Abu Ubaidah ibn al-Jarrah
The army was lined up on a front of , facing west, with its left flank lying south on the Yarmuk River a mile before the ravines of "Wadi al Allan" began. The army's right flank was on the Jabiyah road in the north across the heights of "Tel al Jumm'a", with substantial gaps between the divisions so that their frontage would match that of the Byzantine battle line at . The centre of the army was under the command of Abu Ubaidah ibn al-Jarrah (left centre) and Shurahbil bin Hasana (right centre). The left wing was under the command of Yazid and the right wing was under Amr ibn al-A'as.