"When King Psammetichus (ie. Psamtik II) came to Elephantine, this was written by those who sailed with Psammetichus the son of Theocles, and they came beyond Kerkis as far as the river permits. Those who spoke foreign tongues (Greek and Carians who also scratched their names on the monument) were led by Potasimto, the Egyptians by Amasis.Kerkis was located near the Fifth Cataract of the Nile "which stood well within the Cushite Kingdom.
This was the first confrontation between Egypt and Nubia since the reign of Tantamani. A Kushite king named Anlamani had revived the power of the kingdom of Napata. Psamtik II's campaign was likely initiated to destroy any future aspirations the Kushites may have had to reconquer Egypt.
The Egyptian army advanced to Pnubs (Kerma) and the capital city of Napata in a series of fierce battles, where they looted its temples and destroyed the royal Kushite statues. The Kushite capital was sacked under the reign of the native Kushite king Aspelta who was the younger brother of Anlamani and the son of Senkamanisken. The Year 3 Karnak stela is dated to II Shemu day 10 of Psamtik II's reign and states that:
The army that your Majesty sent to Nubia has reached the land of Pnubs....Nubians from all parts [of Kush] had arisen against him, their hearts full of anger when he attacked those who had rebelled against him there; because he was furious at those who had arisen against him. His Majesty took part in the combat as soon as he reached the battle. The rebels capitulated before a single arrow was unleashed against them....Those who tried to flee did not succeed and were brought back as prisoners: four thousand two hundred men.
As a result of Psamtik's devastating campaign, Kush's power was crushed, and its kings from Aspelta onwards lost any opportunity of ever seizing control of Egypt. Instead, the Nubian rulers decided to shift their capital further south from Napata to the relative safety of Meroë. Curiously, however, Psamtik II does not appear to have capitalized on his victory. His troops retreated back to the First Cataract, and Elephantine continued to be the southern border of Egypt.
An outcome of this campaign was the deliberate destruction of monuments belonging to the 25th Dynasty Kushite kings in Egypt "by hacking out their names and the emblems of royalty from their statues and reliefs.
In 591 BC, during the fourth year of his reign, Psamtik II launched an expedition into Palestine "to foment a general Levantine revolt against the Babylonians" that involved, among other, Zedekiah of the Kingdom of Judah.