This was a good clue, Servant!
I found this in the
Wikipedia:
Josephus relates several other incidents in connection with the Biblical account of Moses:
Before the incident in which Moses slew the Egyptian, Moses had led the Egyptians in a campaign against invading Ethiopians and routed them. While Moses was besieging one of the Ethiopians' cities, Tharbis, the daughter of the Ethiopian king, fell in love with Moses and wished to marry him. He agreed to do so if she would procure the deliverance of the city into his power. She did so immediately, and Moses promptly married her [Antiquities of the Jews page 61]. This marriage is also mentioned in Numbers 12:1 (Cushite meant Ethiopian; Zipporah was Midianite, definitely not Ethiopian). The account of this expedition is also mentioned by Irenaeus [Fragments from the Lost Writings of Irenaeus, XXXII], and the event would explain why St. Stephen refers to Moses as "mighty in his words and in his deeds" before Moses slayed the Egyptian.
This definitely is not supported by Ellen White.
“Though called a 'Cushite woman' (Numbers 12:1, R.V.), the wife of Moses was a Midianite, and thus a descendant of Abraham. In personal appearance she differed from the Hebrews in being of a somewhat darker complexion. Though not an Israelite, Zipporah was a worshiper of the true God.” {PP 383.3}