A contemporary of the Egyptian ruler *Psammetichus I, an alliance was made between these two kings in c.655 or 654 BC, and it is probable that Gyges' action in sending troops to help Egypt enabled *Psammetichus I to overthrow the *Assyrian domination and establish a renewal of national power. This action also encouraged the kings of the Twenty-sixth Dynasty to pursue a policy of reliance on foreign and mercenary military support.
BIBL. Luckenbill, D.D. Ancient Records of Assyria and Babylonia, (two vols) Chicago: 1926-7 (1968), 2: para. 785.
Biographical Dictionary of Ancient Egypt by Rosalie and Antony E. David
Ancient Egypt. A Reference Guide. EdwART. 2011.