The abstracts are talking and trade relations between the eastern Desert and ancient Egypt. The Medijay were a police force that also served as mercenaries and guards for tombs across Egypt. Medijay are the Blemmeyes of Greco-Roman texts,and also the Trogadytes of the Periplus[a Greek sailor guidebook]. I have always thought the people with no heads were southern Sudanese tribes.
What else would you like to know?