of Egypt, Gibbon does not blame anyone as much as he praises the character and genius of Amr for the victory at Heliopolis. Gibbon says "the conquest of Egypt may be explained by the character of the victorious Saracen, one of the first of his nation." Whether through the foolishness of the Byzantine generals, including Theodore, contributed to what then occurred, certainly Amr fought a brilliant battle at Heliopolis. When the Byzantine army began approaching, Amr divided his army into three separate units, with one detachment under the command of a trusted commander, Kharija. This unit marched abruptly east to nearby hills, where they effectively hid. This unit was to remain there until the Romans had begun the battle, at which point they were to fall on the Roman flank or rear, whichever was more vulnerable. The second detachment Amr ordered to the south, which would be the direction the Romans would flee if the battle went badly. Once the Byzantine forces initiated contact with Amr's forces and commenced an attack, the detachment of Kharija attacked the Byzantine rear, which was completely unexpected by the Romans. Theodore had not kept scouts out, or, if he had, he ignored their warning of the approaching Arab horsemen. This attack from the rear created utter chaos among the Byzantine ranks. As Theodore's troops attempted to flee to the south, they were attacked by the third detachment, which had been placed there for just such a purpose. This completed the final break-down and defeat of the Byzantine army, which fled in all directions. Theodore survived, but with only a tiny fragment of his army, while the remainder was killed or captured. In the battle's aftermath, most of southern and central Egypt fell to Amr's forces. The defeat at Heliopolis was crucial, as it removed the last Roman force standing between the Islamic invaders and the heart of Egypt. However, not only did the Battle of Heliopolis leave Egypt practically defenceless, it also encouraged the disaffected natives, most of whom were Monophysite Christians and had suffered on-and-off persecution at the hands of Constantinople, to rise up against their Roman oppressors. Although the Byzantine Empire was certainly by lineage the Roman Empire, its traditions, language, and ruling elite, by this time, were Greek. The Greeks of Egypt, whose numbers could scarcely equal a tenth of the native population, were overwhelmed by the universal defection of those