Note 372 — Chapter XXIV · CONQUEST OF EGYPT. A.H. XX. A.D. 641.
Reading edition
The tale of Amru being taken prisoner in an attack on the outworks is not mentioned by any early authority, and seems to possess no foundation. The story is, that when carried before the authorities, his freedman, who had been captured with him, slapped Amru on the face, and so deceived the Greeks into the belief that he was a common soldier who might be set at liberty.