"After the Arab recapture of Alexandria [from the Byzantines in [A.D 646], a number of Coptic [Egyptian Christian] villages complained to `Amr ibn-al-'As [the governor] that they had not joined in the rebellion but that, on the contrary, the Byzantine army from Alexandria had plundered them and requisitioned food from them without repayment .The original treaty signed with 'Amr after the first surrender of Egypt had, they pointed out, imposed tributeupon them . They had not , however, been protected during Manual's invasion, and, in consequence ,they had suffered heavy loses .'Amr immediately admitted the justice of their complaint and ordered compensation to be paid for the loses .It is just to record that the Arabs ,at this period ,were extremely conscientious  about the mutal obligation which rested on them to protect the people who thereby came under their guardianship"(Lt. Gen. Sir John Bagot Glubb,The Great Arab Conquest [London: Hodder and Stoughton, Ltd., 1963] , pp. 284-285).