Herodotus also says that the Colchians, the people of modern Georgia, are the descendants of Sesostris' army and of a colony founded on the Black Sea. His evidence was primarily the shared rites of circumcision, along with some nebulous claims that the people were "black," which in those days was a conventional way of saying they were located close to the east, where the sun rose and therefore "burned" them. The same word for "black" was also used to describe Greece's own olive-skinned people.
Based on this, Robert Temple, the ancient astronaut theorist, argued in The Sirius Mystery (1976) that Colchis was an actual Egyptian colony and that it was through this colony that the sacred truth that flying space frogs from Sirius had given humanity civilization was passed from Egypt to Greece, and thus from the Greeks to the Dogon of Africa.
At least Temple stopped there.
Strangely, there almost seemed to be confirming evidence of this. There is an actual population of African descendants living in Georgia. In 1988 Afrocentrist John G. Jackson explained why these people prove that Africa had conquered the classical world and gave it civilization:
This area has been called the ‘Black Soviet’ because there are so many Black people living down there. Of course they tell you in the history books that these people are the descendants of slaves that the Russians imported in the Middle Ages. But if this territory was settled by the Egyptians in ancient times, then these people are probably their descendants.
Quoted in James E. Brunson and Runoko Rashidi, “Sitting at the Feet of a Forerunner: An April 1987 Meeting and Interview with John G. Jackson,” in African Presence in Early Asia, eds. Runoko Rashidi and Ivan Van Sertima (New Brunswick: Transaction, 1988): 198.
For these 30 people to have been the remains of Sesostris' army requires us to assume that the Egyptians brought an army composed of both Black men and women, that they in-bred for three thousand years, never took any non-Black people for spouses, and somehow maintained a reproductively viable population in the face of isolation and discrimination. The Africans of Colchis knew the truth and tried to tell the Afrocentrists, who refused to listen. Ethnographers and archaeologists listened, and through their work we know the truth: They are the last descendants of Ottoman-era slaves from when the territory was part of Turkey.
This is a far cry from imaginary Egyptian armies and flying space frogs, but it has the virtue of being true.