They were first attested during the reign of Psammetichus I and their presence increased constantly.
Because this information can relate to either Psammetichus I or II (in the reign of Psammetichus III, ca.
The Twenty-sixth Dynasty was not in conflict with Kush in the days of Psammetichus I.
However, as Sauneron and Yoyotte have shown, an undated fragmentary text from Edfu bearing the cartouche of Psammetichus I describes a war in Lower Nubia (Wawat), which proves that relations between Egypt and Kush were not peaceful during Psammetichus I's reign (Sauneron and Yoyotte 1952b: 201; Habachi 1974: 325-26; Kahn 2006: 263-67).
THE LETTER OF ARISTEAS IN REFERENCE TO THE CAMPAIGN OF PSAMMETICHUS I DURING THE REIGN OF MANASSEH (BEFORE 642)
These scholars suggested identifying the psammetichus of the Letter of Aristeas with Psammetichus I and proposed dating the Judean aid to one of two occasions during the reign of this pharaoh (Sauneron and Yoyotte 1952a: 133-35):
Manasseh, King of Judah (697-642), is known to have sent troops to assist Ashurbanipal and Necho I's successor, Psammetichus I, who returned with the Assyrians to Sais.
Psammetichus I was a vassal of Assyria as well and probably returned with the Assyrians after he had earlier fled (([phi][epsilon][upsilon]ov[tau][alpha]) the Kushites (Herodotus, The Histories, II 152).
Even if he did participate in the Assyrian campaign of 664, Ashurbanipal was still the overlord, while Psammetichus I had only just come to power after the death of his father, Necho I, who had died in a battle against Tanutamun, King of Kush, some months earlier (Herodotus, The Histories, II 152).
In 656 at the latest Psammetichus I gained control over Upper Egypt (Kahn 2006: 266).
This incident can be dated after regnal year 9 (656), which saw the reunification of Egypt under Psammetichus I, but it must have preceded the campaigns against Wawat (Lower Nubia).