Quick questions on Empire, army and administration in New Kingdom Egypt (HSC Ancient History Section IV)

The empire rested on a transformed army. From the Hyksos and the wider Near East Egypt adopted the light two-wheeled chariot, drawn by two horses and crewed by a driver and a warrior; the composite bow, laminated from wood, horn and sinew for far greater range and penetration than the old self bow; bronze weaponry including the curved khopesh sickle-sword; and better scale armour and helmets. The chariotry became the prestige striking arm, and infantry of archers and spearmen filled out the line. Troops were grouped into large divisions or hosts under royal command; the familiar four divisions named for the gods Amun, Ra, Ptah and Seth are best documented later, in the Ramesside period, so for this early phase it is safer to speak of divisions and hosts than of a fixed four-fold system.