The Roman position was worsened by the absence of Egypt's prefect, Tenagino Probus, who was battling pirates. According to Zosimus, the Palmyrenes were helped by an Egyptian general named Timagenes; Zabdas moved into Egypt with 70,000 soldiers, defeating an army of 50,000 Romans. After their victory, the Palmyrenes withdrew their main force and left a 5,000-soldier garrison. By early November, Tenagino Probus returned and assembled an army; he expelled the Palmyrenes and regained Alexandria, prompting Zabdas to return. The Palmyrene general aimed a thrust at Alexandria, where he seems to have had local support; the city fell into Zabdas' hands, and the Roman prefect fled south. The last battle was at the Babylon Fortress, where Tenagino Probus took refuge; the Romans had the upper hand, since they chose their camp carefully. Timagenes, with his knowledge of the land, ambushed the Roman rear; Tenagino Probus committed suicide, and Egypt became part of Palmyra. In the "Augustan History" the Blemmyes were among Zenobia's allies, and Gary K. Young cites the Blemmyes attack and occupation of Coptos in 268 as evidence of a Palmyrene-Blemmyes alliance.