In the year 730 B.C., a man by the name of Piye decided the only way to save Egypt from itself was to invade it. Things would get bloody before the salvation came.
“Harness the best steeds of your stable,” he ordered his commanders. The magnificent civilization that had built the great pyramids had lost its way, torn apart by petty warlords. For two decades Piye had ruled over his own kingdom in Nubia, a swath of Africa located mostly in present-day Sudan. But he considered himself the true ruler of Egypt as well, the rightful heir to the spiritual traditions practiced by pharaohs such as Ramses II and Thutmose III. Since Piye had probably never actually visited Lower Egypt, some did not take his boast seriously. Now Piye would witness the subjugation of decadent Egypt firsthand—“I shall let Lower Egypt taste the taste of my fingers,” he would later write.
A nice 5 page history of the Nubian rule of Egypt. From Arch. News.