sentences:  In Diodorus's version, however, the draining of the river prompted the Egyptians (whom Thucydides does not mention) to defect and surrender to the Persians.The Persians, not wanting to sustain heavy casualties in attacking the Athenians, instead allowed them to depart freely to Cyrene, whence they returned to Athens.Since the defeat of the Egyptian expedition caused a genuine panic in Athens, including the relocation of the Delian treasury to Athens, Thucydides's version is probably more likely to be correct.