The Pítati (pí-ta-ti) were a contingent of archers of ancient Egypt that were often requested and dispatched to support Egyptian vassals in Canaan. They are recorded in the correspondence of the 1350 BC Amarna letters, and were often requested to defend against the Habiru, also rogue vassal-kings and foreign troops of neighboring kingdoms (for example, Hatti), who were on the attack.
The vassal cities and "city-states" were constantly requesting the services-(protection) of the Pharaoh's armies, by means of this "archer-army" force, basically garrison forces. A request for lodging, and preparations of food, drink, straw, and other supplies required, is often demanded by the pharaoh, for a small, or a large contingent.
The pítati archer force were mercenaries from the southern Egyptian "land of Kush"-(named Kaša, or Kaši in the letters).
The first use of Nubian mercenaries was by Weni of the Sixth Dynasty of Egypt during the Old Kingdom of Egypt, about 2300 BC.
A vassal–state letter example from Hiziru, a "mayor", often referred to as the "Man (Lugal) of the City", in ancient Palestine is EA 337, entitled "Abundant supplies ready". The letter is short and undamaged:
Say to the king, my lord, my Sun, my god: Message of Hiziru, your servant. I fall at the feet of the king, my lord, 7 times and 7 times. The king, my lord, wrote to me, "Prepare the supplies before the arrival of a large army of pí-ta-ti of the king, [m]y l[ord]." May the god of the king, my lord, grant that the king, my lord, come forth along with his large army and learn about his lands. I have indeed prepared accordingly abundant supplies before the arrival of a large army of the king, my lord.